Page 196 - Maths Skills - 8

194 Maths

Solution: Step 1: Construct two perpendicular lines– horizontal and vertical on a graph paper. Name the
horizontal axis as X-axis and vertical axis as Y-axis.
Step 2: Take ‘Activities’ along X-axis and number of hours (frequency) along Y-axis.
Step 3: Choose a uniform width and gap of the bars along the X-axis.

Step 4: Choose a suitable scale to determine the height of the bar. Here, we take 1 unit as 1 hour.
Thus, the bar graph showing the number of hours spent on various activities is as follows:

DOUBLE BAR GRAPH
A double bar graph is used to show two sets of data simultaneously. It is useful for the comparison of two sets of
data as in the following cases.
Case 1: When results of students in different subjects for two years are to be shown.

Case 2: When result of a student in different subjects is to be compared with the class average in those subjects.
Case 3: When current sale of the production of a company is to be compared with the sale of the previous year,
either item-wise or month-wise.

Let’s Attempt

Example: The performance of two students Varun and Pallavi in a particular examination is given below.
Draw a double bar graph for the data.

Subjects English Science Maths S.St Hindi

Varun 80 75 93 77 67
Pallavi 85 82 95 86 74

Solution: Step 1: Draw two perpendicular lines representing X and Y-axis respectively.
Step 2: Along X-axis, mark the subjects at equal widths and equal gaps; along Y-axis mark the
‘marks obtained’, choosing a suitable scale.
Step 3: Along Y-axis, choose the scale: 1 unit = 10 marks.
Step 4: Draw bars of equal widths corresponding to the marks obtained by both the students as
shown in the figure.