= Test: Final Exam Question 22 of 27 > This test: 100 point(s) possible This question: 6 point(s) possible Submit test The state test scores for 12 randomly selected high school seniors are shown on the right. Complete parts (a) through (c) 1429 1228 982 below. 698 730 833 Assume the population is normally distributed. 723 749 546 630 1447 950 (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 (].) (Round to one decimal place as needed.)