QUESTION 3 A. The diastolic blood pressure (DBP) among those in the early 20's is normally distributed with a mean of 78.5 and standard deviation of 15 mm Hg.

(i) What proportion of the population has DBP above 85 mm Hg?

(ii) Determine the 6th and the 92nd percentile values for the DBP readings for the population.

(iii) Would a person with a DBP reading of 65 mm Hg be considered to be in the lowest 5% value in the population? Justify your answer.