Page 151 - Maths Skill - 6

Data Handling and Presentation 149

Solution: (i) On a sheet of paper, draw two lines
perpendicular to each other. They are Scale:
called the horizontal axis (or X-axis) and X-axis: 10 divisions = 1 hr
vertical axis (or Y-axis).

(ii) On the horizontal axis we represent
“hours” and on the vertical axis we
represent “different ways time is spent
everyday”.

(iii) Now, choose a scale. On the horizontal
axis we need a total of 8 hours. So
we can take 1 cm to represent 1 hour
(adjacent Fig.)

(iv) Choose the width of the bars so that
7 bars can be shown within the space
available on the vertical axis. Let us
take 1 cm as the width of a bar and 1 cm

space between the bars. Make sure that
the bars are of equal width and there is (Bar graph of how time is spend everyday by a child)
equal spacing between the bars.

Example 2: The number of cycles produced by a factory in a week is given as below:

Mon Tue Wed Thu Fri
800 900 1200 900 1400
Draw a bar graph to represent the above information.
Solution: Steps to draw the bar graph are as follow:

Step 1: On a graph paper draw a horizontal and vertical line.
Step 2: Along a horizontal line, mark the days at points taken at equal distance.
Step 3: Choose the scale as

1 division = 100 cycles.
Step 4: The heights of bars are as follows:
1
Production on Monday = × 800 = 8th division
100
1
Production on Tuesday = × 900 = 9th division
100
1
Production on Wednesday = × 1200
100
= 12th division

1
Production on Thursday = × 900 = 9th division
100
1
Production on Friday = × 1400 = 14th division
100