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A random sample of 49 lunch customers was taken at a restaurant. The average amount of time the customers in the sample stayed in the

A random sample of 49 lunch customers was taken at a restaurant. The average amount of time the customers in the sample stayed in the restaurant was 33 minutes. From past experience, it is known that the standard deviation equals 10 minutes. Construct a 99% confidence interval for the true average amount of time customers spent in the restaurant.

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