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?

Answer 1

My favourite webpage for this kind of question:
http://davidmlane.com/hyperstat/z_table.html

Just enter the data and pick the "between" option

Answer 2

I don't know if I got it right but my answer was 0.005422 in the top calculator and for the bottom it was 0.05. Is that correct?