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AustraliaNSW
Stage 5.1-2

9.03 The spread of data sets

Interactive practice questions

Two groups of people, athletes and non-athletes, had their resting heart rate measured. The results were displayed in a pair of box plots.

  Athletes  
 
40
50
60
70
80
90
 
  Non-athletes  
 
40
50
60
70
80
90
Beats per minute
 
a

What is the median heart rate of athletes?

b

What is the median heart rate of the non-athletes?

c

Using this measure, which group has the lower heart rates?

Athletes

A

Non-athletes

B
d

What is the interquartile range of the athletes' heart rates?

e

What is the interquartile range of the non-athletes' heart rates?

f

Using this measure, which group has more consistent heart rate measures?

Athletes

A

Non-athletes

B
Easy
3min

The two box plots below show the data collected by the manufacturers on the life-span of light bulbs, measured in thousands of hours.

Easy
3min

A builder can choose between two different types of brick that are coloured red or yellow. The box plots below illustrate the results of tests on the strength of the bricks.

Easy
1min

A class took an English test and a Mathematics test. Both tests had a maximum possible mark of $25$25. The results are illustrated below.

Easy
2min
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Outcomes

MA5.2-15SP

uses quartiles and box plots to compare sets of data, and evaluates sources of data

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