3E)Keegan measured 40 randomly sampled ages of members at a health club (Franchise ##3.102F1) in Milwaukee. The sample had a mean age of 45 years. Compute a 99% confidence interval using this sample. Assume the population standard deviation is 13.8 years. Use z=2.576z=2.576 in your calculations.

6)You measure the weight of 31 randomly chosen textbooks, and find they have a mean weight of 48 ounces. Assume the population standard deviation is 14.3 ounces. Based on this, construct a 95% confidence interval for the true population mean textbook weight. Use z = 2 (rather than 1.96) for your calculations. Give your answers as decimals, to two places