# Question

A dentist wants to find the average time taken by one of her hygienists to take X-rays and clean teeth for patients. She recorded the time to serve 24 randomly selected patients by this hygienist. The data (in minutes) are as follows:
Assume that such times for this hygienist for all patients are approximately normal.
a. What is the point estimate of the corresponding population mean.
b. Construct a 99% confidence interval for the average time taken by this hygienist to take X-rays and to clean teeth for all patients.

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