A random sample of 16 pharmacy customers showed the waiting times below (in minutes).

Waiting times in minutes
21
22
14
17
20
25
19
16
22
16
14
17
26
19
12
18
Find a 90 percent confidence interval for µ, assuming that the sample is from a normal population. (Round your standard deviation answer to 4 decimal places and t-value to 3 decimal places.