year 8 maths

650
17 a i Answers will vary.
ii Answers will vary.
iii Random processes give different results.
b i Different vowels have different frequencies of
occurring.
ii If a high frequency word has an unusual range of
vowels, e.g. a page or webpage on Mississippi.
Exercise 9B
1 a true b false c true d true e false
2 a 5 b 3 c sport d 20
3 a 2 b 7 c red d 27
e Favourite colour in 8B
Number of students
pink
blue
yellow
green
red
Colour
4 a 8 b 24 c 8 d 7
e 2 f 8 g yes (between 2 & 5)
5 a 120 cm b 20 cm
c 60 cm
d 11 years old
6 a
160
Mitchell’s height
140
120
100
80
60
40
20
0
8 9 10 11 12
Age ( years)
b
Height (cm)
Height (cm)
160
140
120
100
80
60
40
20
0
Fatu’s height
8 9 10 11 12
Age ( years)
7 a
1995 2000 2005 2010 2015
Using public
transport
30 25 40 50 60
Driving a car 60 65 50 40 20
Walking or cycling 10 20 15 15 25
b 2010 and 2015
c 2015
d Environmental concerns; others answers possible.
e Public transport usage is increasing; other answers
possible.
8 a 60
50
40
30
20
10
0
2000 2001 2002 2003 2004 2005
Year
boys girls
Number of births
b 2000 c 2004 d 2002 e boys
9 a It has increased steadily. b approx. $38 000
c approx. $110 000−$130 000
10 Helps to compare different categories quickly by
comparing heights.
11 a It is unequal.
b The axes have no labels and it does not have a title.
c
35
30
Favourite subjects
25
20
15
10
5
0
Number of votes
art
maths
English
Subject
d four times as popular
e one and a half times as popular
history
science
f Makes growth appear to have tripled when in fact it has
only increased slightly.
12 a 7
b 7
c 3M : 8, 3S : 4
d 3M
e 3M because best student got 10.
13 a 1500 b 104000 c increased
d approx. 590000 passengers
14 240
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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