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Homework: Homework 5 (H5) Part 3 of 3 Points: 0.25 of 1 Save The state test scores for 12 randomly selected high school seniors are shown on the right. Complete 1429 1222 981 D parts (a) through (c) below. 698 N 836 Assume the population is normally distributed 725 746 540 627 1441 945 (a) Find the sample mean. x = 909.8 (Round to one decimal place as needed.) (b) Find the sample standard deviation s = 304.1 (Round to one decimal place as needed.) (c) Construct a 99% confidence interval for the population mean u A 99% confidence interval for the population mean is () (Round to one decimal place as needed.) Clear all ple Get more help