A simple random sample of 20 paperback novels indicates that they are, on average, 425.1 pages long. Asume that the page count for all paperback novels is Normally distributed, with a standard...

A simple random sample of 20 paperback novels indicates that they are, on average, 425.1 pages long. Asume that the page count for all paperback novels is Normally distributed, with a standard deviation of 92.8 pages. Calculate a 99% confidence interval for the mean.