A population has a mean =78and a standard deviation =7.

Find the mean and standard deviation of a sampling distribution of sample means with sample size n=49.

Assume the random variable x is normally distributed with mean=50 and standard deviation =7. Find the indicated probability.

P(x>36)

People were polled on how many books they read the previous year. How many subjects are needed to estimate the number of books read the previous year within one book with 95%confidence? Initial survey results indicate that =11.1 books.

Construct the indicated confidence interval for the population mean using at-distribution. c=0.99,x=111, s=10, n=15