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The electric cooperative needs to know the mean household usage of electricity by its non-commercial customers in kWh per day. Assume that the population standard

The electric cooperative needs to know the mean household usage of electricity by its non-commercial customers in kWh per day. Assume that the population standard deviation is2.3 kWh. The mean electricity usage per family was found to be15.3kWh per day for a sample of3611families. Construct the99%confidence interval for the mean usage of electricity. Round your answers to one decimal place.

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