The following times, in seconds, were recorded for a 100 m race: 13.9 14.3 14.4 13.7 15.2 15.4 13.9

13.9 14.5 14.7 14.4 13.8 13.1 13.8

12.4 13.8 12.7 13.4 13.9 14.0 14.4

14.3 14.5 11.8 12.9 12.3 12.8 13.7

13.1 15.0 14.8 14.2 14.4 14.8

a) explain how you would sort the data into
i) three intervals and
ii) five intervals

b) Which number of intervals in part
i) would be the most appropriate ? Explain why.

please explain how you got the answer