The amounts spent by 160 shoppers at a supermarket are summarised in the following table: Amount spent ($?) 0

The amounts spent by 160 shoppers at a supermarket are summarised in the following table:

a) Draw a cumulative frequency graph of this distribution.

b) Estimate the median and the interquartile range of the amount spent.

c) Estimate the number of shoppers who spent more than $115.

d) Calculate an estimate of the mean amount spent.