(Solved): in a study of exercise a large group of male runners walk on the treadmill for six minutes after thi ...
in a study of exercise a large group of male runners walk on the treadmill for six minutes after this exercise their heart rates vary with mean 8.5 per five seconds and center deviation one per five seconds let X be the mean number of heartbeats per five seconds after measuring heart rate for 12 five second intervals, assume number of heartbeats per five seconds, is approximately normally distributed
A) what is the approximate probability the X is less than 8
B) what is the probability that the heart rate of a runner is less than 100 bpm hint restate this event in terms of X