A study is being conducted on the resting heart rate of long distance runners. It is believed that for a particular type of long distance runners the mean resting heart rate is believed to be 65 beats per minute (bpm) with a standard deviation of 6.2 bpm. For a random sample of 12 such runners were studied the average resting heart rate was 62 bpm with a standard deviation of 9.6 bpm. In this scenario, the value of 6.2 bpm is the
A. µ ("mu")
B. s
C. σ ("sigma")
D. Xbar (sample mean)