A researcher plans to select a random sample of patients at the Emergency Medical Center, to obtain information about their waiting times (in minutes) before being attended to. Suppose the waiting time X of a patient is normally distributed. 10 patients were selected randomly and the waiting time was recorded for each of them; the results are below. 18 23 15 19 21 19 24 22 23 22 Find the 90% confidence interval of the mean waiting time for those patients. Select one: O a. (20.09, 21.11) O b. (16.07, 25.13) O c. (19.17, 22.03) O d. (18.98, 22.22)

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