E Homework: Section 6.2 Homework Question 10, 6.2.25-T HW Score: 78.57%, 11 of 14 points o Part 3 of 3 x Points: 0 of 1 Save The state test scores for 12 randomly selected high school seniors are shown on the right. Complete parts (a) through (c) below. 1420 1221 980 Assume the population is normally distributed. 697 725 839 725 749 544 629 1443 949 . . . . . (a) Find the sample mean. x= 910.1 (Round to one decimal place as needed.) (b) Find the sample standard deviation. s= 302.3 (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.) X Vi Vi ([,!) T More Help Me Solve This View an Example Get More Help - Media Clear All Check