A World Health Organization study (the MONICA project) of health in various countries reported that in Canada,

Question:

A World Health Organization study (the MONICA project) of health in various countries reported that in Canada, systolic blood pressure readings have a mean of 121 and a standard deviation of 16. A reading above 140 is considered to be high blood pressure.
a. What is the z -score for a blood pressure reading of 140? How is this z -score interpreted?
b. The systolic blood pressure values have a bell-shaped distribution. Report an interval within which about 95% of the systolic blood pressure values fall.