n a study of exercise, a large group of male runners walk on a treadmill for 36 minutes. Their heart rates in beats per minute at the end vary from runner to runner according to the normal distribution with a mean of 129 and standard deviation of 10.31 . What percent of the runners have heart ratesbetween 135 and 148?

14.015

96.73

3.27

71.97

28.03

48.365

1.635

35.985

24.76