We know that: Mean = 82 mm and SD = 10 mm ( standard deviation ) 82 - 3 * SD = 82 - 3 * 10 = 82 - 30 = 52 mm 82 + 3 * SD = 82 + 3 * 10 = 82 + 30 = 112 mm Population between 52 and 112 mm is within +/- 3 standard deviations from the mean. By the 66- 95 - 99.7 % rule it is: 99.7% of the test group. 0.977 * 500 = 498.5 Answer: 99.7 % of the test group have a diastolic pressure between 52 and 112 mm, or 498 men.
