A)Assume the random variable x is normally distributed with mean mu=80 and standard deviation sigma=4. Find the indicated probability.

P(68

B)

Construct the confidence interval for the population mean mu.

c=0.98, x overbar=15.5, sigma=8.0, and n=90

A 98% confidence interval for mu is ( )?

C)The mean height of women in a country (ages 20-29) is 63.7 inches. A random sample of 60 women in this age group is selected. What is the probability that the mean height for the sample is greater than 65 inches? Assume sigma=2.99.

The probability that the mean height for the sample is greater than 65 inches is ( )?