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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 that the population standard deviation is 1.5 gallons. The mean water usage per family was found to be 17.5 gallons per day for a sample of 543 families. Construct the 98% confidence interval for the mean usage of water. Round your answers to one decimal place.

Sagot :

irinmehdi

Answer:

The monthly amount of water used per household in a small community is normally distributed with mean 7,069 gallons and standard deviation 58 gallons. Find the three quartiles for the amount of water used.

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