The state test scores for 12 randomly selected high school seniors are shown on the right. Complete parts (a) through (c) below. 1421 1222 988 691 721 830 Assume the population is normally distributed. 724 740 549 627 1447 946 (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 95% confidence interval for the population mean u. A 95% confidence interval for the population mean is ( D. (Round to one decimal place as needed.)

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