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?

1 answer

Try this wonderful program,

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

You can convert to data to z-scores or use it directly

It is preset for a mean of 0 and SD of 1