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Mathematics, 05.07.2019 19:20 conyabrew82

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 2.3 gallons. the mean water usage per family was found to be 18.1 gallons per day for a sample of 386 families. construct the 80% confidence interval for the mean usage of water. round your answers to one decimal place.

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