9. Shopping spree The figure below is a cumulative relative frequency graph of the amount spent by 50 consecutive grocery shoppers at a store. Cumulative relative frequency (%) 10 20 20 40 501 60 70 80 70 100 Amount spent (f) (a) Estimate the interquartile range of this distribution. Show your method. (b) What is the percentile for the shopper who spent $19.507 (c) Draw the histogram that corresponds to this graph