The systolic blood pressure in millimeters was measured for

The systolic blood pressure in millimeters was measured for a large sample of people. The average pressure was 116 mm, and the standard deviation was 19 mm. Use the normal model to estimate the following percentages.
The normal density with mean ? = 116 and standard deviation ? =19 is shown below.

About 11 % of people have systolic blood pressure over?

Solution

92.63mm

11% corresponds to -1.23 standard deviations (Use Z-chart)

116 + (-1.23 * 19) = 116 - 23.37 = 92.63