The state test scores for 12 randomly selected high school seniors are shown 1425 on the right. Complete parts (a) through (c) below. 700 Assume the population is normally distributed. 723 625 (a) Find the sample mean. X= (Round to one decimal place as needed.) (b) Find the sample standard deviation. S= (Round to one decimal place as needed.) (c) Construct a 99% confidence interval for the population mean μ. A 99% confidence interval for the population mean is (). (Round to one decimal place as needed.) 1224 727 740 1449 981 831 548 940 □

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