A man runs 1 mile approximately once per weekend. He records his time over an 12-week period. The individual times and summary statistics are given in the table below. Week Time (minute) Week Time (minute) 12.80 7 12.30 2 12.20 8 12.08 3 12.25 9 11.72 4 12.18 10 11.57 5 11.53 11 11.73 6 12.47 12 12.67 Compute the (a) median and (b) coefficient of variation of the individual times for 12-week period