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The water works commission needs to know the mean household usage of water by the residents of a small town in gallons per day. Assume

The water works commission needs to know the mean household usage of water by the residents of a small town in gallons per day. Assume that the population standard deviation is 2.3gallons. The mean water usage per family was found to be 18.518.5 gallons per day for a sample of 717families. Construct the 80%confidence interval for the mean usage of water. Round your answers to one decimal place.

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