the electric cooperative needs to know the mean household usage of electricity by its non-commercial customers in kwh per day. they would like the estimate to have a maximum error of 0.1 kwh. a previous study found that for an average family the variance is 5.76 kwh and the mean is 16.2 kwh per day. if they are using a 80% level of confidence, how large of a sample is required to estimate the mean usage of electricity?
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