Page 204 - Maths Skills - 7

202 Maths

DOUBLE BAR GRAPH
As we recalled the construction of bar graph above, we will now learn about double bar graph wherein two
different values of the same variable are considered at a time.
Let’s learn through example.

Let’s Attempt

Example: The performance of a student in SA1 and SA2 is given below. Draw a double bar graph for the data.

Subject English Science Maths S. St Hindi
SA1 80 75 93 77 67
SA2 84 82 95 86 74

Solution: We draw a double bar graph for the data given Y Y Y-axis: 10 small divisions = 10 marks-axis: 10 small divisions = 10 marks
Y
SA
above by following these steps: 100 95 SA11
100
95
93
93 SA22
SA
Step 1: Draw two perpendicular lines 90 84 86
90
86
84
82
80
representing X and Y axis as OX and 80 80 75 82 77 74
77
80
75
74
OY respectively. 70 67
67
70
Step 2: Along OX, mark the subjects at 60
60
equal widths and gaps; along OY 50
50
mark the ‘marks obtained’, choosing Marks Marks
40
a suitable scale. 40
30
30
Step 3: Along OY, choose the scale: 10
20
small divisions = 10 marks. 20
10
Step 4: Draw bars of equal widths 10
corresponding to the marks obtained 0 0 English ScienceScience MathsMaths SST Hindi X X
English
Hindi
SST
by the student in SA1 and SA2 as
Subjects
shown in Fig. Subjects
Exercise 1 2.2
1. Read the bar graph and answer the following questions.
(i) What information is given by
the bar graph? Scale
Y-axis: 10 small divisions = 50 vehicles
(ii) When is the hourly traffic
maximum? Also write the
maximum number of vehicles.
(iii) When is the hourly traffic
minimum? Also write the
minimum number of vehicles.
(iv) Find the total number of
vehicles passing through the
crossing during the day.