The water works commission needs to know the mean household usage of water by the residents of a small town in gallons p

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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.
They would like the estimate to have a maximum error of 0.14
gallons. A previous study found that for an average family the
standard deviation is 2.3 gallons and the mean is 15 gallons per
day. If they are using a 99% level of confidence, how large of a
sample is required to estimate the mean usage of water? Round your
answer up to the next integer.