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Steps to construct a pie chart:

Find the angle Draw a circle and Label each Write down
of sector for divide it into different sectors sector. the title of the
each category. based on the angles calculated. pie chart.

Colour of Number of Fraction of Angle of the sector
cars cars the circle Angle of the sector
9 9 Frequency of data
Red 9 × 360° = 90° = × 360°
36 36 Total frequency
12 12
Yellow 12 × 360° = 120°
36 36
10 10
White 10 × 360° = 100°
36 36
5 5
Blue 5 × 360° = 50°
36 36
Total 36 1 360°

Sales of Cars of Dynamic Model

Blue
Red
50°
100°
White 120°
Yellow

This pie chart is suitable for comparing each colour of the cars with the total number
of cars.

(c) Line graph
A line graph is a data representation used to display changes of data over a period CHAPTER
of time. The data is represented by points which are connected in a straight line.
12
6

The table shows the temperature of a patient over a particular period of time. Construct a
line graph to represent the data and justify the appropriateness of the data representation.

Time (a.m.) 1 2 3 4 5 6 7 8 9 10
Temperature
(°C) 37.8 37.9 38.2 38.4 38.2 37.9 37.9 37.6 37.6 37.5

271
Data Handling

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