The state test scores for 12 randomly selected high school seniors are shown on the right. Complete parts (a) 1424 through (c) below. 694 729 Assume the population is normally distributed. 629 (a) Find the sample mean. x= 910.6 (Round to one decimal place as needed.) (b) Find the sample standard deviation. s= 305.1 (Round to one decimal place as needed.) (c) Construct a 90% confidence interval for the population mean . A 90% confidence interval for the population mean is (Round to one decimal place as needed.) CCC 1230 720 750 1446 986 830 541 948

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