The cumulative frequency diagram shows the times taken by the members of two different clubs, The Braineys and The Cleverites, to complete an intelligence test.
Cumulative
frequency
a) Find the median and the
interquartile range for The Cleverites
80
60
b) State which club, on average, was
slowest at completing the test.
Give a reason for your answer.
40
The Cleverites
The Braineys
20
0
10
20
50
30
40
Time, in minutes​