The mean systolic blood pressure of adult males is normally

Question

distributed with a mean of 138 (millimeters of
mercury) and a standard deviation of 9.7. What percent
of adult males have blood pressure between 161.28 and
164.9?

Answer 1

Z = (score-mean)/SD

Calculate the two z scores. Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion between these two Z scores.