7.81 Rh-Positive The proportion of individuals with an Rh-positive blood type is 85%. You have a random sample of n = 500 individuals.

a. What are the mean and standard deviation of p, the sample proportion with Rh-positive blood type?

b. Is the distribution of approximately normal? Jus- tify your answer.

c. What is the probability that the sample proportion p exceeds 82%?

d. What is the probability that the sample proportion lies between 83% and 88%?

e. The sample proportion would lie between what two limits 99% of the time?