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 0.14 kWh.  A previous study found that for an average family the variance is 4.84 kWh and the mean is 19.1 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?   Question 8 options:   45 households   1959 households   949 housholds   405 households

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