Unit:
3: Data
Handling
Exercise: 1 (Multiple Choice Questions and Answers 1-16)
In Questions 1 to 16,
there are four options, out of which
only one is correct. Write the correct answer.
Question: 1
Let be three observations. The mean
of these observations is
a.
b.
c.
d.
Solution
(b)
Here, and are three observations.
We
know that,
Question: 2
The number of trees in different parks of a city
are The mode of this data is
a.
b.
c.
d.
Solution
(c)
The given data is:
On arranging the given data in ascending
order, we get:
Here, occurs most frequently.
Mode is the observation that occurs most frequently in the data.
Therefore, mode of the given data
Question: 3
Which measures of central tendency get affected
if the extreme observations on both the ends of a data arranged in descending
order are removed?
a. Mean
and mode
b. Mean
and Median
c. Mode
and Median
d. Mean,
Median and Mode
Solution
(a)
Mean is defined as follows:
So, if we remove the
extreme values, sum of observations and
total number of observations will change.
Hence, mean will also
change.
Mode is that
observation which occurs the most.
So, if extreme values
are removed, mode can be affected. Median is the mid value when the given data
is arranged in ascending or descending order. So, if extreme values are removed
then the mid value remains same.
Hence, median will not
change.
Question: 4
The range of the data: is
a.
b.
c.
d.
Solution
(a)
Highest observation
Lowest observation
Range Highest observation Lowest observation
Question: 5
The median of the data: is
a.
b.
c.
d.
Solution
(c)
We know that, median is the middle most
observation.
For finding the median of the data, arrange
the data in ascending order.
Ascending order:
Median
Value of observation
Value of observation
observation
Question: 6
Out of brands of chocolates in a shop, a
boy has to purchase the brand which is most liked by children. What measure of
central tendency would be most appropriate if the data is provided to him?
a. Mean
b. Mode
c. Median
d. Any
of the three
Solution
(b)
Mode is the most appropriate central
tendency because it is the observation that occurs most frequently.
Here, by the measurement of mode, we can
find out the chocolates which is most liked by children.
Question: 7
There are aces in each of the given set of
cards placed face down. From which set are you certain to pick the two aces in
the first go?
a.
b.
c.
d.
Solution
(c)
From third set, we are certain to pick the
two aces in the first go because it has only cards and it is given that every set has aces.
Question: 8
In the previous question, what is the
probability of picking up an ace from set (d)?
a.
b.
c.
d.
Solution
(b)
Probability
Total no. of cards in set
No. of possible
outcomes [given, aces in every set]
So, probability of getting an ace from set
(d)
Question: 9
The difference between the highest and the
lowest observations in a data is its
a. frequency
b. width
c. range
d. mode
Solution
(c)
The difference between the highest and the
lowest observations in a data is its range.
Question: 10
In a school, only out of students can participate in a
quiz. What is the chance that a student picked at random makes it to the
competition?
a.
b.
c.
d.
Solution
(b)
Total number of outcomes Total number of students
Number of possible outcomes Students participating in a quiz
Probability
To find percentage, multiply it by hundred.
Probability
Question: 11
Some integers are marked on a board. What is the
range of these integers?
a.
b.
c.
d.
Solution
(b)
Here, highest observation
and lowest observation
Range Highest observation Lowest observation
Question: 12
On tossing a coin, the outcome is
a. only
head
b. only
tail
c. neither
head nor tail
d. either
head or tail
Solution
(d)
When we toss a coin, the outcome is either
head or tail.
Question: 13
The mean of three numbers is All the three numbers are
different natural numbers. If lowest is what could be highest possible
number of remaining two numbers?
a.
b.
c.
d.
Solution
(a)
Mean of numbers and the lowest number
Let the other two numbers be and respectively.
Since is the lowest number, so for highest possible
value of remaining two numbers, one must be
Let
From eq. (i), we get
So, highest possible number
Question: 14
Khilona earned scores of respectively in her first three
examinations. If she scored in the fourth examination, then
her average score will be
a. increased
by
b. increased
by
c. decreased
by
d. decreased
by
Solution
(d)
Average score
Average score in first three examinations
Also, average score in four examinations
Decrease in average score
Hence, average score is decreased by
Question: 15
Which measure of central tendency best
represents the data of the most popular politician after a debate?
a. Mean
b. Median
c. Mode
d. Any
of the above
Solution
(c)
Mode is the most frequent observation in a
data. So, this measure of central tendency best represents the data of most
popular politician after a debate.
Question: 16
Which of the following has the same mean, median
and mode?
a.
b.
c.
d.
Solution
(d)
We have to find out mean, median and mode of the data given for each
option.
For
option (a)
Data (in ascending order)
Here,
Median Value of observation
Value of observation
Mode most frequent observation
Hence, Mean Median Mode
For
option (b)
Data (in ascending order)
Here,
Median Value of observation
Value of observation
Mode most frequent observation
Hence, Mean Median Mode
For
option (c)
Data (in ascending order)
Here,
Median Value of observation
Value of observation
Mode most frequent observation
Hence, Mean Median Mode
For
option (d)
Data (in ascending order)
Here,
Median Value of observation
Value of observation
Mode most frequent observation
Hence, Mean Median Mode
In
Questions 17 to 31, fill in the blanks to make the statements true.
Question: 17
The difference between the highest and the
lowest observations of a data is called _________.
Solution
The difference between the highest and the
lowest observations of a data is called range.
Question: 18
The mean of a data is defined as _________.
Solution
Question: 19
In a set of observations, the observation that
occurs the most often is called _________.
Solution
In a set of observations, the observation that
occurs the most often is called mode.
Question: 20
If a given data, arranged in ascending or
descending order, the middle most observation is called _________.
Solution
If a given data, arranged in ascending or
descending order, the middle most observation is called median.
Question: 21
Mean, Median, Mode are the measures of
_________.
Solution
Mean, Median, Mode are the measures of central tendency.
Question: 22
The probability of an event which is certain to
happen is _________.
Solution
The probability of an event which is certain to
happen is 1
Question: 23
The probability of an event which is impossible
to happen is _________.
Solution
The probability of an event which is impossible
to happen is 0.
Question: 24
When a die is thrown, the probability of getting
a number less than is _________.
Solution
When we throw a die, outcomes are possible, i.e.
Total possible outcomes
Number of favourable outcomes (less than )
[all outcomes are less
than ]
Question: 25
In throwing a die, the number of possible
outcomes is _________.
Solution
When we throw a die, outcomes are possible. They
are
In throwing a die, the number of possible
outcomes is 6.
Question: 26
_________ can be used to compare two collections
of data.
Solution
A double bar graph can be used to compare two
collections of data.
Question: 27
The representation of data with bars of uniform
width is called _________.
Solution
The representation of data with bars of uniform
width is called a bar graph.
Question: 28
If the arithmetic mean of then the value of is _________.
Solution
We know that,
Hence, the value of
Question: 29
The median of any data lies between the
_________ and _________ observations.
Solution
The median of any data lies between the minimum and maximum observations.
Question: 30
Median is one of the observations in the data if
number of observations is _________.
Solution
Median is one of the observations in the data if
number of observations is odd.
Question: 31
Rohit collected the data regarding weights of
students of his class and prepared the following table:
Weight (in kg)
|
|
|
|
|
Number of Students
|
|
|
|
|
A student is to be selected randomly from his
class for some competition. The probability of selection of the student is
highest whose weight is in the interval _________.
Solution
We know that,
Probability
To make the probability highest, we have to
take the interval where number of students, i.e. possible outcomes are highest.
Here, probability is highest whose weight
is in the interval .
In
Questions 32 to 49, state whether the statements are True or False.
Question: 32
If a die is thrown, the probability of getting a
number greater than is
Solution
False
As we know, a die has six numbers on it,
i.e. So, it is impossible to get a
number greater than Hence, if a die is thrown,
the probability of getting a number greater than is
Question: 33
When a coin is tossed, there are possible outcomes.
Solution
True
If a coin is tossed, then
Maximum possible outcomes i.e. head or tail.
Question: 34
If the extreme observations on both the ends of
a data arranged in ascending order are removed, the median gets affected.
Solution
False
If the extreme observations on both the
ends of a data arranged in ascending order are removed, then the mean and mode
gets affected but median remains same.
Question: 35
The measures of central tendency may not lie
between the maximum and minimum values of data.
Solution
False
The measures of central tendency lie
between the maximum and minimum values of the data
Question: 36
It is impossible to get a sum of of the numbers on both dice when
a pair of dice is thrown together.
Solution
True
When a die is thrown, total possible
outcomes are
So, when a pair of dice is thrown together,
maximum sum will be if and only if both dice get together.
So, the pair will be and the sum is
It is impossible to get a sum
of on both dice, when a pair of
dice is thrown together.
Question: 37
The probability of the spinning arrow
stopping in the shaded region (Fig. 3.4) is
Solution
True
Favourable outcomes
Number of shaded regions
Total number of possible outcomes
Total number of regions
Probability
Question: 38
A coin is tossed times and the outcomes are
recorded as follows:
H T T H T H H H T T H T H T T.
The chance of occurence of a head is per cent.
Solution
False
Number of times in which head occurs
Total number of times, the coin is tossed
Probability of getting a head
,
which is not equal to per cent.
Question: 39
Mean, Median and Mode may be the same for some
data.
Solution
True
Mean, median and mode can be the same for
some data.
See Q. No. 16.
Question: 40
The probability of getting an ace out of a deck
of cards is greater than
Solution
False
Probability of an event can never be
greater than
For any event E,
.
Question: 41
Mean of the data is always from the given data.
Solution
False
It is not compulsory that mean of the data
is always from the given data. It may or may not be the observation from given
data.
Question: 42
Median of the data may or may not be from the
given data.
Solution
True
Case 1:
Here,
Median Value of observation
Value of observation
Value of observation
This value belongs to the given data.
Case
2:
Here,
This value does
not belong to the given data.
Question: 43
Mode of the data is always from the given data.
Solution
True
Mode of the data is always from the given
data as it is the most frequent observation in the data.
Question: 44
Mean of the observations can be lesser than each
of the observations.
Solution
False
Mean is the average value of all the
observations. Some of the observations are less than it and some of
observations are greater than it.
Question: 45
Mean can never be a fraction.
Solution
False
e.g., mean of
Question: 46
Range of the data is always from the data.
Solution
False
It is not necessary as range is the
difference of highest observation and lowest observation.
Question: 47
The data has every observation as mode.
Solution
True
Given data is Here, each observation has
same frequency, so every observation is a mode.
Question: 48
The range of the data would change if was subtracted from each
value in the data.
Solution
False
Range before subtraction
Data after subtraction is:
Range after subtraction
Range of the data in both the cases is
same.
Question: 49
The range of the data would change if was added to each value in the
data.
Solution
False
Range before adding 8
Maximum observation Minimum observation
Data after adding 8:
Range after adding :
Maximum observation Minimum observation
So, the range is same.
Question: 50
Calculate the Mean, Median and Mode of the
following data:
Are these three equal?
Solution
Given data is
Sum of all observations
No. of observations
Mean
Given data is in ascending order.
So, median value of observation
value of observation
value of observation
Mode most frequent data
Hence, mean median mode.
Question: 51
Find the mean of the first ten even natural
numbers.
Solution
First ten even natural numbers
Sum of all observations
No. of observations
Mean
Question: 52
A data constitutes of heights (in cm) of children. What do you understand
by mode for the data?
Solution
Mode is the observation that occurs most
frequently in a set of observation. Here, for the given data, mode is the
height that appears most frequently.
Question: 53
A car seller collects the following data of cars
sold in his shop.
Colour of Car
|
Number of Cars Sold
|
Red
|
|
Black
|
|
White
|
|
Silver
|
|
Others
|
|
a.
Which colour of the car is most liked?
b.
Which measure of central tendency was used in
(a)?
Solution
a.
Red colour of the car liked by
people
Black colour of
the car liked by people
White colour of
the car liked by people
Silver colour of
the car liked by people
Other colour of
the car liked by people
Hence, black
colour of the car is the most liked.
b.
Mode is used in (a).
Question: 54
The marks in a subject for students are as follows:
For the given data, find the
a.
Range
b.
Mean
c.
Median
d.
Mode
Solution
Given data is:
The given data in ascending order:
a. Range highest observation lowest observation
b.
Mean
c.
Here,
d.
Mode Most frequent observation
Question: 55
The following are weights (in kg) of people.
a.
Find the mean of the weights of the people.
b.
How many people weigh above the mean weight?
c.
Find the range of the given data.
Solution
a.
The weights of persons are:
Sum of weights
of people
No. of
observation (persons)
Mean
b.
Weights above are i.e. persons.
c. Range
Maximum observation Minimum observation
Question: 56
Following cards are put facing down:
What is the chance of
drawing out
a. a vowel
b. A or I
c. a card marked U
d. a consonant
Solution
a.
We can clearly see that all the
letters are vowels, i.e. A, E, I, O, U
Hence, it is
certain to draw a vowel.
So, probability
b.
probability
c.
Probability
d.
probability
Hence, it is not
possible to draw a consonant.
Question: 57
For the data given below, calculate the mean of
its median and mode.
Solution
Given data in ascending order is:
Here,
Median Value of observations
Value of observation
observation
Mode most frequent observation
Mean of median and mode
Question: 58
Find the median of the given data if the mean is
Solution
Given, mean
We know that,
mean
Now arrange the data in ascending order.
Here,
Question: 59
What is the probability of the sun setting
tomorrow?
Solution
Setting of the sun is a sure event. Hence,
its probability is
Question: 60
When a spinner with three colours (Fig. 3.5) is
rotated, which colour has more chance to show up with arrow than the others?
Solution
From the figure, area covered by the yellow
colour is maximum out of the given three colours. Hence, chance of yellow
colour to show up with arrow will be more.
Question: 61
What is the probability that a student chosen at
random out of girls and boys is a boy?
Solution
Given, total children boys and girls
So, favourable outcomes for a boy
Total number of possible outcomes
Probability
Question: 62
The letters written on paper slips of the word
MEDIAN are put in a bag. If one slip is drawn randomly, what is the probability
that it bears the letter D?
Solution
In the word ‘MEDIAN’, there is only one D.
So, favourable outcomes number of letter D
Total number of possible outcomes
Probability
Question: 63
Classify the following events as certain to
happen, impossible to happen, may or may not happen:
a.
Getting a number less than on throwing a die.
b.
Getting head when a coin is tossed.
c.
A team winning the match.
d.
Christmas will be on December.
e.
Today moon will not revolve around the earth.
f.
A ball
thrown up in the air will fall down after some time.
Solution
a.
Getting a number less than on throwing a die is
impossible, as a die does not have a number less than on it.
b.
Getting head, when a coin is
tossed may or may not happen as a coin has head and tail on its two faces. So,
we might get a head or a tail on tossing it.
c.
A team may or may not win a
match.
d.
Christmas is certain to happen
on December.
e.
It is impossible that moon will
not revolve around the earth.
f.
It is certain to happen that a ball thrown up
in the air will fall down after sometime due to gravity.
Question: 64
A die was thrown times and the outcomes recorded were
Find the mean, median and mode of the data.
Solution
Given data is
Arranging the data in ascending order, we
have
Mean
Mode most frequent observation
Median value of observation value of observation
value of
observation
Question: 65
Find the mean of first six multiples of
Solution
First six multiplies of 4 are:
Mean
Hence, the mean of six multiplies of
Question: 66
Find the median of first nine even natural
numbers.
Solution
First nine even natural numbers are
Here,
Median value of observation value of observation
value of
observation
Question: 67
The mean of three numbers is The mean of other four numbers is
Find the mean of all the numbers.
Solution
Mean of numbers
Hence, sum of three numbers
Mean of other numbers
Hence, sum of other numbers
Mean of all the numbers
Question: 68
Find the mode of the given data:
Solution
We know that, mode is the most frequent
observation in the data.
Mode
Question: 69
Given below are heights of boys of a class measured in cm:
Find
a.
The height of the tallest boy.
b.
The height of the shortest boy.
c.
The range of the given data.
d.
The median height of the boys.
Solution
Given, height (data) of boys of a class are
Arranging the given data in ascending
order, we have
a.
By observing the data, height
of the tallest boy
b.
By observing the data, height
of the shortest boy
c.
Here, highest observation and lowest observation ,
Range highest observation lowest observation
d.
Median value of observation value of observation
value of
observation
Question: 70
Observe the data and answer the questions that
follow:
a. Which data value can be put in the data so that the mode
remains the same?
b. At least how many and which value(s) must be put in to
change the mode to
c. What is the least number of data values that must be put in
to change the mode to Name them.
Solution
Given data;
Arranging the given data in ascending
order, we have
a.
As per the given data, is the mode of data, since it has highest
frequency, i.e.
Now, if is added to the given data, mode will get
changed to and whereas if any other number, i.e. is added, mode will remain same.
b.
At least two should be added to change the mode to On adding two the frequency of will be maximum, i.e.
c.
We will have to add at least
three to change the mode to On adding three the frequency of will be maximum, i.e.
Question: 71
Age (in years) of children of two groups are
recorded as below:
Age (in Years)
|
Group A
|
Group B
|
|
|
a.
Find the mode and range for each group.
b.
Find the range and mode if the two groups are
combined together.
Measures of central tendency are used to
describe the middle of a data set. Mean, median, and mode are measures of
central tendency.
Solution
From the given table, age of children in
group A:
Age of children in group B:
a.
Mode in group A [ occurs most frequent, i.e. times]
Range in group A
Maximum value Minimum value
Mode in group B
[ is the most frequent, i.e. ]
Range in group B
Maximum value Minimum value
b.
If both groups are combined
together
Mode [ occurs most frequent, i.e. times]
Range Maximum value Minimum value
Question: 72
Observe the given bar graph carefully and answer
the questions that follow.
a.
What information does the bar graph depict?
b.
How many motor bikes were produced in the first
three months?
c.
Calculate the increase in production in May over
the production in January.
b.
In which month the production was minimum and
what was it?
c.
Calculate the average (mean) production of bikes
in months.
Solution
a.
The given bar graph shows the
production of motor bikes by XYZ automobiles Ltd. during January to June.
b.
Total number of motor bikes
produced in first three months
Motor bikes produced in January Motor bikes produced in February Motor bikes produced in March
c.
Increase in production in May
over the production in January
Production in May Production in January
d.
By observing the graph, we can
say that the production was minimum in the month of June, i.e.
e.
Average production
Question: 73
The bar graph given below shows the marks of
students of a class in a particular subject:
Study the bar graph and answer the following
questions:
a.
If is the pass mark, then how many
students have failed?
b.
How many students got marks from to
c.
How many students scored marks and above?
d.
If students who scored marks above are given merits then how many
merit holders are there?
e.
What is the strength of the class?
Solution
a.
If is the passing marks, then
students who got marks less than will be failed.
No. of students
who failed
b.
No. of students who got marks
from (No. of students who got marks from )
+ (No. of students who got marks from to )
c.
No. of students who scored marks & above No. of students who scored marks
d.
No. of students who scored
marks above No. of students who score No. of students who score
Since students
who scored marks above are given merits.
Number of
students who are merit holders
e.
Strength of the class Total no. of students who scored different
marks
Question: 74
Study the bar graph given below and answer the
questions that follow.
a.
What information does the above bar graph
represent?
b.
In which year was production the least?
c.
After which year was the maximum rise in the
production?
d.
Find the average production of rice during the years.
e.
Find difference of rice production between years
and
Solution
After studying the bar graph, we have
Production of rice in million tonnes
Production of rice in million tonnes
Production of rice in million tonnes
Production of rice in million tonnes
Production of rice in million tonnes
a.
The bar graph shows the production
of rice in million tonnes by a country during years
b.
The production of rice was the
least in i.e. million tonnes.
c.
The maximum production of rice
was in The production rose after
d.
Sum of productions
Average
production
Average
production million tonnes
e.
Production in million tonnes and production in million tonnes
Difference million tonnes
Question: 75
Study the bar graph given below and answer the
questions that follow :
a.
What information is depicted from the bar graph?
b.
In which subject is the student very good?
c.
Calculate the average marks of the student.
d.
If and above marks denote a
distinction, then name the subjects in which the student got distinction.
e.
Calculate the percentage of marks the student
got out of
Solution
a.
The given bar graph shows marks
obtained by a student in different subjects out of
b.
Subject in which student is
very good is Maths as he scored highest marks in it.
c.
d.
In Hindi & Maths, student
got marks, respectively. Since, the marks equal to
or above denote a distinction. Hence, student
got distinction in Hindi & Maths.
e.
Percentage marks
Question: 76
The bar graph given below represents the
circulation of newspapers (dailies) in a town in six languages (the figures are
approximated to hundreds).
Study the bar graph and answer the following
questions:
a.
Find the total number of newspapers read in
Hindi, Punjabi, Urdu, Marathi and Tamil.
b.
Find the excess number of newspapers read in
Hindi than those in English.
c.
Name the language in which the least number of
newspapers are read.
d.
Write the total circulation of newspapers in the
town.
Solution
Number of newspapers in Urdu
Number of newspapers in Tamil
Number of newspapers in English
Number of newspapers in Hindi
Number of newspapers in Marathi
Number of newspapers in Punjabi
a.
Total no. of newspapers read in
Hindi, Punjabi, Urdu, Marathi & Tamil
b.
Excess no. of newspapers read
in Hindi than those English No. of newspapers read in Hindi no. of newspapers read in English
c.
Out of all the newspapers,
least no. of newspapers is in Tamil, i.e., newspapers are read.
d.
Total circulation of newspapers
in the town No. of newspapers in six different languages
Question: 77
Study the double bar graphs given below and
answer the following questions:
a.
Which sport is liked the most by Class VIII
students?
b.
How many students of Class VII like Hockey and
Tennis in all?
c.
How many students are there in Class VII?
d.
For which sport is the number of students of
Class VII less than that of Class VIII?
e.
For how many sports students of Class VIII are
less than Class VII?
f.
Find the ratio of students who like Badminton in
Class VII to students who like Tennis in Class VIII.
Solution
a.
By observing the graph, we can
say that the height of the bar corresponding to cricket for class VIII student
is largest.
Hence, cricket
is liked the most by class VIII students.
b.
Height of bar corresponding to
hockey and tennis for class VIl are and respectively.
So, total students
of class VII who like hockey and tennis
c.
Total number of students in
class VIl Sum of heights of all the bars for class VII
d.
The sport for which number of
students of class VII is less than that of class VIII will be that for which
height of bar is less.
By observing the
graph in case of cricket height of bar is less for class VII as compared to
class VIII.
e.
We can clearly see from the
double bar graph for Hockey, Football, Tennis and Badminton, the number of
students are less for class VIIl as compared to class VII.
f.
Number of students who like
badminton in class VII and number of students who like tennis in
class VII
Required ratio
Question: 78
Study the double bar graph shown below and
answer the questions that follow:
a.
What information is represented by the above
double bar graph?
b.
In which month sales of Brand A decreased as
compared to the previous month?
c.
What is the difference in sales of both the
Brands for the month of June?
d.
Find the average sales of Brand B for the six
months.
e.
List all months for which the sales of Brand B
was less than that of Brand A.
f.
Find the ratio of sales of Brand A as compared
to Brand B for the month of January.
Solution
a.
The given double bar graph
compares the sales of brands A and B during the months of January to June.
b.
We can clearly see from the
double bar graph that sales for brand A reduced in the month of March compared
to that of February.
c.
Sales of brand A in June and sales of brandB in June
Difference in
sales
d.
Average sales of brand B Total sales of brand B in months from January to June
e.
We can clearly see from the
double bar graph that sales of brand B is less than sales of brand A in the
month of April and June.
f.
Sales of brand A in January and sales of brand B in January
Required ratio
Question: 79
Study the double bar graph given below and
answer the questions that follow:
a.
What information is compared in the above given
double bar graph?
b.
Calculate the ratio of minimum temperatures in
the year to the year for the month of November.
c.
For how many months was the minimum temperature
in the year greater than that of year Name those months.
d.
Find the average minimum temperature for the
year for the four months.
e.
In which month is the variation in the two
temperatures maximum?
Solution
a.
The given double bar graph
compares the minimum temperature during the month November to February for the
years and
b.
Minimum temperature of November
in year
Minimum
temperature of November in year
Required ratio
c.
We can clearly see from the
double bar graph that the minimum temperature in the year greater than that of the year
for the month of February and
November.
d.
Average minimum temperature for
year
e.
Difference of temperature for
different months can be shown by following table:
Month
|
Difference of temperature
|
November
|
|
December
|
|
January
|
|
February
|
|
From the above
table, it is clear that for the month of February variation in two temperatures
is maximum.
Question: 80
The following table shows the average intake of
nutrients in calories by rural and urban groups in a particular year. Using a
suitable scale for the given data, draw a double bar graph to compare the data.
Foodstuff
|
Rural
|
Urban
|
Pulses
|
|
|
Leafy vegetables
|
|
|
Other vegetables
|
|
|
Fruits
|
|
|
Milk
|
|
|
Fish and flesh foods
|
|
|
Fats and Oils
|
|
|
Sugar/Jaggery
|
|
|
Solution
Steps to construct the bar graphs are as
follows:
Step
I Firstly, we draw two lines perpendicular to each
other on a graph paper and call them horizontal and vertical axes.
Step
Il Along the horizontal axis, we mark the foodstuff
and along the vertical axis, we mark the intake of nutrients (calories).
Step
Ill We choose a suitable scale to determine the
heights of bars. Here, we choose the scale as small division to represent
Step
IV First, we draw the bars for rural and then bars
of urban for different foodstuff. Bars for rural and urban are shaded
separately and the shading is shown at the top right corner of the graph.
Question: 81
Study the double bar graph and answer the
questions that follow:
a.
What information does the double bar graph
represent?
b.
Find the total number of boys in all sections of
Class VII.
c.
In which sections, the number of girls is
greater than the number of boys?
d.
In which section, the number of boys is the
maximum?
e.
In which section, the number of girls is the
least?
Solution
a.
The given graph shows the
number of students (boys and girls) in different sections of class VII.
b.
It is clear from the graph,
total number of boys in all sections of class VIl Sum of heights of all the
bars corresponding to boys in different sections
c.
It is clear from the graph that
in sections VII A and VII D, the number of girls are greater than the number of
boys.
d.
From the graph, it is clear
that in section VII B, number of boys is maximum.
e.
From the graph, it is clear
that in section VII C, number of girls is minimum,
Question: 82
In a public library, the following observations
were recorded by the librarian in a particular week:
Days
|
Mon
|
Tues
|
Wed
|
Thurs
|
Fri
|
Sat
|
Newspaper Readers
|
|
|
|
|
|
|
Magazine Readers
|
|
|
|
|
|
|
a.
Draw a double bar graph choosing an appropriate
scale.
b.
On which day, the number of readers in the
library was maximum?
c.
What is the mean number of magazine readers?
Solution
- Steps
to construct the bar graphs are as follows:
Step I We draw two lines
perpendicular to each other on a graph paper and call them horizontal and
vertical axes.
Step Il Along the
horizontal axis, we mark the days and along the vertical axis, we mark the
readers.
Step Ill We choose a
suitable scale to determine the heights of bars. Here, we choose the scale as small division to represent
Step IV First, we draw the
bars for newspaper readers and then bars for magazine readers for different
days. Bars for newspapers and magazine readers are shaded separately and the
shading is shown in the top right corner of the graph paper.
b.
Total no. of both readers on
different days are:
Day
|
Readers
|
Mon
|
|
Tue
|
|
Wed
|
|
Thur
|
|
Fri
|
|
Sat
|
|
Hence, it is
clear that the no. of readers was maximum on Thursday.
c.
Mean of readers
Question: 83
Observe the following data:
Government School,
Chandpur
|
Daily Attendance
Date :
|
Class
|
Total Students
|
Number of Students
Present on that Day
|
VI
|
|
|
VII
|
|
|
VIII
|
|
|
IX
|
|
|
X
|
|
|
a.
Draw a double bar graph choosing an appropriate
scale. What do you infer from the bar graph?
b.
Which class has the maximum number of students?
c.
In which class, the difference of total students
and number of students present is minimum?
d.
Find the ratio of number of students present to
the total number of students of Class IX.
e.
What per cent of Class VI students were absent?
Solution
a.
A double bar graph is shown
below:
From the bar
graph, maximum no. of students was absent in Class VI on whereas minimum no. of students was absent in
class X.
b.
Clearly, class VIII has maximum
no. of students i.e,
c.
The difference of total no. of
students & no. of students present is minimum for class X i.e,
d.
No. of students present in
class IX
Total no. of
students in class IX
Hence, required
ratio
e.
Total no. of students in class
VI
No. of students
present in class VI
No. of absent
students
Percentage of
absent students of class VI
Question: 84
Observe the given data:
Days of the Week
|
Mon
|
Tues
|
Wed
|
Thurs
|
Fri
|
Sat
|
Number of Mobile Phone Sets Sold
|
|
|
|
|
|
|
a.
Draw a bar graph to represent the above given
information.
b.
On which day of the week was the sales maximum?
c.
Find the total sales during the week.
d.
Find the ratio of the minimum sale to the
maximum sale.
e.
Calculate the average sale during the week.
f.
On how many days of the week was the sale above
the average sales?
Solution
a.
In order to construct a bar
graph representing the above data, we follow the following steps:
Step I Take a graph paper
and draw two mutually perpendicular lines OX and OY. Call OX as the horizontal
axis and OY as the vertical axis.
Step Il Along OX, mark
days and along OY, mark number of mobile phone sets sold.
Step Ill Along OX, choose
the uniform (equal) width of the bars and the uniform gap between them,
according to the space available for the graph,
Step IV Choose a suitable
scale to determine the heights of the bars, according to the availability of
space. Here, we choose small division to represent mobile sets.
b.
It is clear from the graph that
on Saturday the sales was maximum.
c.
Total sale during the week sum of all the sales on each
day
d.
Minimum sale on Friday
Maximum sale on
Saturday
Required ratio
e.
Average sale
f.
On Monday, Tuesday, Thursday
& Saturday, i.e., on days, the sale was above the average sale.
Question: 85
Below is a list of tallest buildings in India.
This list ranks buildings in India that stand at
least tall, based on standard height
measurement. This includes spires and architectural details but does not
include antenna marks. Following data is given as per the available information
till . Since new buildings are always under construction, go on-line to check
new taller buildings.
Use the information given in the table about sky
scrapers to answer the following questions:
Name
|
City
|
Height
|
Floors
|
Year
|
Planet
|
Mumbai
|
|
|
|
UB Tower
|
Bengaluru
|
|
|
|
Ashok Towers
|
Mumbai
|
|
|
|
The Imperial I
|
Mumbai
|
|
|
|
The Imperial II
|
Mumbai
|
|
|
|
RNA Mirage
Oberoi Woods
|
Mumbai
|
|
|
|
Tower I
Oberoi Woods
|
Mumbai
|
|
|
|
Tower II
Oberoi Woods
|
Mumbai
|
|
|
|
Tower III
|
Mumbai
|
|
|
|
MVRDC
|
Mumbai
|
|
|
|
a.
Find the height of each storey of the three
tallest buildings and write them in the following table:
Building
|
Height
|
Number of Storeys
|
Height of Each Storey
|
|
|
|
|
|
|
|
|
|
|
|
|
b.
The average height of one storey for the
buildings given in (a) is ______________.
c.
Which city in this list has the largest
percentage of skyscrappers? What is the percentage?
d.
What is the range of data?
e.
Find the median of the data.
f.
Draw a bar graph for given data.
Solution
a.
Clearly, Imperial I, Imperial
Il & Ashok Towers are tallest buildings.
Building
|
Height
|
Number of Storeys
|
Height of Each Storey
|
The Imperial I
|
|
|
|
The Imperial II
|
|
|
|
Ashok Towers
|
|
|
|
b.
Average height of each storey
of buildings in (a) sum of heights of a storey of each building
c.
We can clearly see from data,
Mumbai has maximum no. of skyscrapers. It has skyscrapers.
Required
percentage
d.
Range of data maximum height maximum height
e.
Median
f.
A bar graph is as shown below:
Question: 86
The marks out of obtained by Kunal and Soni in the
Half Yearly Examination are given below:
Subjects
|
English
|
Hindi
|
Maths
|
Science
|
S. Science
|
Sanskrit
|
Kunal
|
|
|
|
|
|
|
Soni
|
|
|
|
|
|
|
a.
Draw a double bar graph by choosing appropriate
scale.
b.
Calculate the total percentage of marks obtained
by Soni.
c.
Calculate the total percentage of marks obtained
by Kunal.
d.
Compare the percentages of marks obtained by
Kunal and Soni.
e.
In how many subjects did Soni get more marks
than Kunal? Which are those subjects?
f.
Who got more marks in S. Science and what was
the difference of marks?
g.
In which subject the difference of marks was
maximum and by how much?
Solution
a.
Steps to construct the bar
graphs are as follows :
Step I We draw two lines
perpendicular to each other on a graph paper and call them horizontal and
vertical axes.
Step Il Along the
horizontal axis, OX mark the subjects and along vertical axis, OY mark the
marks obtained.
Step Ill We choose a
suitable scale to determine the heights of bars. Here, we choose the scale as small division to represent marks.
Step IV First, we draw the
bars for Kunal and then bars for Soni for different years. Bars for Kunal and
Soni shaded separately and the shading is shown in the top right corner of the
graph paper
b. Marks obtained by Soni
c. Marks obtained by Kunal
d.
Ratio of percentage marks
obtained by Soni & Kunal
e.
In English, Hindi &
S.Science, Soni get more marks than Kunal.
f.
Marks obtained by Kunal &
Soni is S.Science are respectively. Therefore, Soni got more marks
than Kunal by marks.
g.
In English & Science the
difference of marks was maximum
Question: 87
The students of Class VII have to choose one
club from Music, Dance, Yoga, Dramatics, Fine arts and Electronics clubs. The
data given below shows the choices made by girls and boys of the class. Study
the table and answer the questions that follow:
Clubs
|
Music
|
Dance
|
Yoga
|
Dramatics
|
Fine Arts
|
Electronics
|
Girls
|
|
|
|
|
|
|
Boys
|
|
|
|
|
|
|
a.
Draw a double bar graph using appropriate scale
to depict the above data.
b.
How many students are there in Class VII?
c.
Which is the most preferred club by boys?
d.
Which is the least preferred club by girls?
e.
For which club the difference between boys and
girls is the least?
f.
For which club is the difference between boys
and girls the maximum?
Solution
a.
Steps to construct the bar
graph are as follows :
Step I We draw two lines
perpendicular to each other on a graph paper and call them horizontal and
vertical axes.
Step Il Along the
horizontal axis, OX mark the clubs and along the vertical axis, OY mark the
number of boys and girls.
Step Ill We choose a
suitable scale to determine the heights of bars. Here, we choose the scale as small division to represent
Step IV First, we draw the
bars for girls and then bars for boys for different years. Bars for girls and
boys are shaded separately and the shading is shown in the top right corner of
the graph paper.
b.
Total students in class VII
c.
From the given data, we can say
that most preferred club by boys is Electronics.
d.
From the given data, we can say
that least preferred club by girls is Yoga.
e.
It is clear from the given data
that in Yoga and Dramatics, the difference between boys and girls is the least,
i.e.
f.
It is clear from the given data
that in Fine Arts the difference between boys and girls is maximum, i.e.
Question: 88
The data given below shows the production of
motor bikes in a factory for some months of two consecutive years.
Months
|
Feb
|
May
|
August
|
October
|
December
|
|
|
|
|
|
|
|
|
|
|
|
|
Study the table given above and answer the
following questions:
a.
Draw a double bar graph using appropriate scale
to depict the above information and compare them.
b.
In which year was the total output the maximum?
c.
Find the mean production for the year
d.
For which month was the difference between the
production for the two years the maximum?
e.
In which month for the year the production was the maximum?
f.
In which month for the year the production was the least?
Solution
a.
Steps to construct the bar
graphs are as follows:
Step I We draw two lines
perpendicular to each other on a graph paper and call them horizontal and
vertical axes.
Step Il Along the
horizontal axis, OX mark the months and along the vertical axis, OY mark the
production of motor bikes.
Step Ill We choose a
suitable scale to determine the heights of bars. Here, we choose the scale as big division to represent
Step IV First, we draw the
bars for Year and then bars for Year for different months. Bars for year and year months are shaded separately and the shading
is shown in the top right corner of the graph paper.
b. total output in year
Total output in
year
Total output in
year is more than that of year
c.
Mean production of the year
d.
It is clear from the given data
in May the difference between the production for the two years in maximum, i.e.
e.
In August the production was
maximum, i.e. as compared to other months of year
f.
In February the production was
minimum, i.e. as compared to other months of year
Question: 89
The table below compares the population (in
hundreds) of towns over two years:
Towns
|
A
|
B
|
C
|
D
|
|
|
|
|
|
|
|
|
|
|
Study the table and answer the following
questions:
a.
Draw a double bar graph using appropriate scale
to depict the above information.
b.
In which town was the population growth maximum?
c.
In which town was the population growth least?
Solution
a.
Steps to construct the bar
graph are as follows :
Step I We draw two lines
perpendicular to each other on a graph paper and call them horizontal and
vertical axes.
Step Il Along the
horizontal axis, OX mark the towns and along the vertical axis, OY mark the
population.
Step Ill We choose a
suitable scale to determine the heights of bars. Here, we choose the scale as small division to represent
Step IV First, we draw the
bars for year and then bars for year for different towns. Bars for year and are shaded separately and the shading is shown
in the top right corner of the graph paper.
b.
It is clear from the graph, the
population growth of town D was maximum.
c.
It is clear from the graph, the
population growth of town A was minimum.
Question: 90
The table below gives the data of tourists
visiting hill stations over two
consecutive years. Study the table and answer the questions that follow:
Hill stations
|
Nainital
|
Shimla
|
Manali
|
Mussoorie
|
Kullu
|
|
|
|
|
|
|
|
|
|
|
|
|
a.
Draw a double bar graph to depict the above
information using appropriate scale.
b.
Which hill station was visited by the maximum
number of tourists in
c.
Which hill station was visited by the least
number of tourists in
d.
In which hill stations was there increase in
number of tourists in the year
Solution
a.
Steps to construct the bar
graph as follows:
Step I We draw two lines
perpendicular to each other on a graph paper and call them horizontal and
vertical axes.
Step Il Along the
horizontal axis, OX mark the hill stations and along the vertical axis, OY mark
the tourist visitors.
Step Ill We choose a
suitable scale to determine the heights of bars. Here, we choose the scale as small division to represent tourists.
Step IV First, we draw the
bars for year and then bars for year for different hill stations. Bars for years and are shaded separately and the shading is shown
in the top right corner of the graph paper
b.
It is clear from the given data
that in year tourists visit Mussoorie the most.
c.
It is clear from the given data
that in year tourists visit Manali the least.
d.
From the graph, we can say that
in there is increase in tourist visitors in the
places; Manali, Nainital, Mussoorie and Kullu.
Question: 91
The table below gives the flavours of ice cream
liked by children (boys and girls) of a society.
Flavours
|
Vanilla
|
Chocolate
|
Strawberry
|
Mango
|
Butterscotch
|
Boys
|
|
|
|
|
|
Girls
|
|
|
|
|
|
Study the table and answer the following
questions:
a.
Draw a double bar graph using appropriate scale
to represent the above information.
b.
Which flavour is liked the most by the boys?
c.
How many girls are there in all?
d.
How many children like chocolate flavour of ice
cream?
e.
Find the ratio of children who like strawberry
flavour to vanilla flavour of ice cream.
Solution
a.
Bar graph:
b.
On observing the bar graph, we
can say that boys like butterscotch the most because the bar for butterscotch
in case of boys is of highest length, i.e.
c.
Total number of girls Sum of heights of bars corresponding to girls
d.
Number of children who like
chocolate flavour Sum of heights of bars for both boys and girls
corresponding to chocolate
e.
Total number of children who
like strawberry
Total number of
children who like vanilla
Ratio of children who like strawberry flavour
to vanilla flavour of ice-cream