Type A and type B batteries were tested This cumulative frequency diagram shows information about the battery life of type A batteries.
a) estimate the interquartile range for type A
b) Estimate the number of type A batteries
that had a life of more than 1600 hours.
Type A
80
c) The box plot shows information about the
70
battery life of type B batteries.
Type B
A
60
50
Cumulative frequency
40
30
20
800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800
Battery life (hours)
Using information from both diagrams write
down the median battery life for each type.
Type A hrs Type B
Total marks: 5
10
hrs (2)
900 1000 1100 1200 1300 1400 1500 1600 1700 1800
Battery life (hours)