15. The following table represents the data from 86 amateur marathon runners at a recent event. The numbers are the running time expressed in minutes. Please show your work. Class Interval f Cumf Cum % rel f 120-124 1 1 1.16 n/a 125-129 6 7 8.14 n/a 130-134 8 15 17.44 .09 135-139 13 28 32.56 n/a 140-144 15 43 50.00 .17 145-149 12 55 63.96 n/a 150-154 12 67 77.91 n/a 155-159 8 75 87.21 n/a 160-164 6 81 94.19 n/a 165-169 5 86 100 n/a

b) If you ran the race in 136 minutes how many people finished behind you?