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?
b. If systolic blood pressure in Canada has a normal distribution, what proportion of Canadians suffers from high blood pressure?
c. What proportion of Canadians has systolic blood pressures in the range from 100 to 140?