year 8 maths

9B
Dot plots and column graphs
537
12 Mr Martin and Mrs Stevensson are the two Year 3 teachers at a school. For the latest arithmetic
quiz, they have plotted their students’ scores on a special dot plot called a parallel dot plot, shown
below.
a What is the median score for class 3 M?
b What is the median score for class 3 S?
c State the range of scores for each class.
Class 3M
d Based on this test, which class has a greater
spread of arithmetic abilities?
e If the two classes competed in an arithmetic
competition, where each class is allowed only
one representative, which class is more likely
Score
to win? Justify your answer.
0 1 2 3 4 5 6 7 8 9 10
Class 3S
13 At a central city train station, three types of services run: local, country and interstate.
The average number of passenger departures during each week is shown in the stacked column
graph.
No. of passengers (×100)
25
20
15
10
5
0
Train passengers at Urbanville Station
2013 2014 2015 2016 2017 2018
Year
interstate country local
a Approximately how many passenger departures per week were there in 2013?
b Approximately how many passenger departures were there in total during 2018?
c Does this graph suggest that the total number of passenger departures has increased or
decreased during the period 2013–18?
d Approximately how many passengers departed from this station in the period 2013–18?
Explain your method clearly and try to get your answer within 10000 of the actual number.
Cambridge Maths NSW
Stage 4 Year 8 Second edition
ISBN 978-1-108-46627-1 © Palmer et al. 2018
Cambridge University Press
Photocopying is restricted under law and this material must not be transferred to another party.