year 8 maths

532 Chapter 9 Data collection, representation and analysis
Example 4
Constructing a column graph
Draw a column graph to represent the following people’s heights.
Name Tim Philip Jessica Donna Nyree
Height (cm) 150 120 140 100 130
SOLUTION
EXPLANATION
Height (cm)
160
140
120
100
80
60
40
20
0
Tim
Height chart
Philip
Jessica
Name
Donna
Nyree
First decide which scale goes on the vertical axis.
Maximum height = 150 cm , so axis goes from 0 cm
to 160 cm (to allow a bit above the highest value).
Remember to include all the features required,
including axes labels and a graph title.
Columns should be of equal width so as not to show
bias or be misleading.
Exercise 9B
UNDERSTANDING AND FLUENCY
1–7 2–8
3–8
1 The graph opposite shows the heights of four boys.
Answer true or false to each of the following statements.
a Mick is 80 cm tall.
b Vince is taller than Tranh.
c Peter is the shortest of the four boys.
d Tranh is 100 cm tall.
e Mick is the tallest of the four boys.
Height (cm)
110
100
90
80
70
60
50
40
30
20
10
0
Height chart
Mick Tranh Vince
Child
Peter
Cambridge Maths NSW
Stage 4 Year 8 Second edition
ISBN 978-1-108-46627-1 © Palmer et al. 2018
Cambridge University Press
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