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Example 20: The following data represents the number of students of class VII and VIII who like
the various types of sports. Represent the data by a vertical double bar graph.

Sports Hockey Football Cricket Tennis Badminton
No. of students of Class VII 7 16 18 10 14
No. of students of Class VIII 6 12 22 7 10

Solution: First, draw two mutually perpendicular lines namely, x-axis and y-axis. On the horizontal
line (x-axis), write the sports name at equal distances and on vertical
line (y-axis), write the number of students which represents the Remember
height of the bars. Let us consider scale: 1 unit length = 2 students A double bar graph can be
Now, for each sport on the x-axis, draw two bars next to each other. used to compare information
Each pair of bars represents the number of students for class VII and related to two data.
class VIII. Use different colours for both the classes.

22 Class VII
20
18 Class VIII
16
Number of students 14 8 6
12
10

2 4
0
Hockey Football Cricket Tennis Badminton
Sports
Example 21: The marks of a student (out of 100) in various subjects during the I term and II term
are given.

Subjects Maths S. St. Science English Hindi
I Term 40 40 55 60 70
II Term 70 50 60 50 70
(a) Draw a double bar graph.
(b) In which subject has the performance improved the most?
(c) In which subject has the performance deteriorated?
(d) In which subject does the performance at par?
(e) What is the difference in the average scores in the I term and II term?
Solution: (a) Y
I Term
Marks obtained by a student 60
Scale: 1 Unit = 10 Marks
80
II Term
70
50
40
30
20
10
0
Maths S. St. Science English Hindi X
Subjects

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