4) A survey is carried out to find the waiting times for 100 customers at a supermarket. waiting time (seconds) 0-30 30-60 60-90 90-120 120-150 150-180 180-210 210-240 number of customers 5 15 33 21 11 7 5 3 a) Calculate an estimate for the mean of the waiting times, by using an appropriate approximation to represent each interval. b) Construct a cumulative frequency table for this data. c) Use the cumulative frequency table to draw a cumulative frequency graph. d) Use the cumulative frequency graph to find estimates for the median and the lower and upper quartiles.

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