7. 80 people work in Jenny's factory.
The table shows some information about the annual pay of these 80 workers.
Annual pay (£x)
10 000 < x ≤ 14 000
Number of workers
32
14 000 < x < 16 000
24
16 000 < x < 18 000
16
18 000
20 000 < x < 40 000
6 2
(a) Write down the modal class interval.
(b) Find the class interval that contains the median.
(c) Work out an estimate for the mean annual pay.
(d) Why is your answer to part (c) and estimate?
