The mean replacement time for a random sample of 12 CD players is 8.6 years with a standard deviation of 4.1 years. Construct the 999 Assume the data are normally distributed, and round to the nearest hundredth when necessary. (6.91, 71.03) (7.48, 60.56) (1.69. 17.32) (2.63 8.43) The mean replacement time for a random sample of 12 CD players is 8.6 years with a standard deviation of 4.1 years. Construct the 999 Assume the data are normally distributed, and round to the nearest hundredth when necessary. (6.91, 71.03) (7.48, 60.56) (1.69. 17.32) (2.63 8.43)