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Confidence interval for the mean time of all deliveries

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In a study relating the amounts of time required for room service delivery at a newly openedRadissonHotel, 20 deliveries had a mean time of 24.2 min and a standard deviation of 8.7 min. The sample data appears to have a bell-shaped distribution. Find the 90% confidence interval for the mean time of all deliveries.

Reference no: EM131173590

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