Question

The speeds of vehicles passing a check point were measured over a period of one hour, to the nearest mph. the data collected is shown in the grouped frequency table
Speed
No. of
vehicles
21-30
31-40
41-50
51-60
4
7
38
42
61-65
66
-
70
71
-
75
5
31
Reply Using Drawing

1.Calculate the difference, to two decimal places between the median and the mean estimated speeds.
2.The speed limit on the road is 60mph. Work out an estimate for the percentage of cars that exceeded the speed limit