The histogram gives information about the waiting time, in minutes, experienced
by patients at a dental surgery. 3.24
a) Complete the frequency table
for this information.
(2)
Time (t minutes)
Frequency
2.4
0
24
30
40
Frequency density
6
60
70
0.8
b) Find an estimate for the lower
quartile of the waiting times of
patients at this surgery.
0
minutes (2)
20
40
60
Time (t minutes)
80
100
Total marks: 4
