Question

A certain group of test subjects had pulse rates with a mean of 73.9 beats per minute and a standard deviation of 11.8 beats per minute. Would it be unusual for one of the test subjects to have a pulse rate of 77.5 beats per​ minute?

Answer 1

No. 77.5 is less than one standard deviation away from 73.9. 65% of the test subjects are between 62.1 bpm and 95.7 bpm.