A random sample of pharmacy customers showed the waiting times below ( in minutes).  17 18 16 20 20 12 19 19 15 27 14 23 15 25 18 20 Find a 90 percent confidence interval for u, assuming that the sample is from a normal population. Round your standard devatiation answer to 4 decimal places and t-value to 3 decimal places. Round your answers to 3 decimal places.

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