Math
posted by Anonymous .
The mean systolic blood pressure of adult males is normally 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?

This little applet is just perfect for your kind of question.
Just enter the data as you have it and choose the "between" option
http://davidmlane.com/hyperstat/z_table.html