The water works commission needs to know the mean household a usage of water by the residence of a small town in gallons per day. Assume that the population standard deviation is 2.4 gallons. The main water usage per family was found to be 19.5 gallons per day for a sample of 3034 families. Construct the 98% confidence interval for the mean usage of water. Round your answer to one decimal place.  What is the LOWER endpoint and

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