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

check out this webpage

http://davidmlane.com/hyperstat/z_table.html

Just enter the mean and sd
click on 'between' and enter your values.