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Suppose average pizza delivery times are normally distributed with an unknown population mean and a population standard deviation of six minutes. A random sample of

Suppose average pizza delivery times are normally distributed with an unknown population mean and a population standard deviation of six minutes. A random sample of 30 pizza delivery restaurants is taken and has a sample mean delivery time of 36minutes.

Find a 90% confidence interval estimate for the population mean delivery time. Enter your answer in interval notation. Round your answer to four decimal places.Do not round any intermediate calculations.

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