The speeds of vehicles passing a checkpoint were measured over a period of one hour, to the

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The speeds of vehicles passing a checkpoint were measured over a period of one hour, to the nearest mph. The data collected is shown in the grouped frequency table.

Speed (mph) 21-30 31-40 41-50 51-60 61-65 66-70 71-75 No. of vehicles

(f) 4 7 38 42 5 3 1 a Write down the modal class. b Calculate the difference, to two decimal places, between the median and the mean estimated speeds. c The speed limit on the road is 60 mph. Work out an estimate for the percentage of cars that exceeded the speed limit.AppendixLO1

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