4. Shopping spree The figure below is a cumulative relative frequency graph of the amount spent by 50 consecutive grocery shoppers at a store. (a) Estimate the interquartile range of this distribution. Show your method. (b) What is the percentile for the shopper who spent $19.50? (c) Draw the histogram that corresponds to this graph. (*Hint: Histograms are not cumulative, think about how to find out how tall the bar would be*).