The waiting time of a random sample of 16 customers at a pharmacy store is given below (in minutes). Waiting time is between the time the prescription was dropped off and the time when the prescription is filled. The sample standard deviation from the following data is 4.017. 27 29 25 19 23 27 23 18 24 24 15 26 16 21 22 21 Construct a 90% confidence interval for the mean waiting time of all customers at the pharmacy store. Assume normal population. (20.33,24.35) (20.74, 24.26) (20.74,25.33) (20.55, 25.12)