A certain group of test subjects had pulse rates with a mean

A certain group of test subjects had pulse rates with a mean of 72.7 beats per minute and a standard deviation of 11.5 beats per minute. Would it be unusual for one of the test subjects to have a pulse rate of 65.7 beats per minute?

Solution

P( z < 65.7 - 72.7 / 11.5 )

P( z < -0.61) = 0.2709

it would be usual for one of the the test subjects to have a pulse rate of 65.7 beats per minute