Question: 2. (20 Points) In order to estimate the average electric usage per month, a sample of 256 houses was selected, and their electric usage determined.

2. (20 Points) In order to estimate the average electric usage per month, a sample of 256 houses was selected, and their electric usage determined. a. Assume a population standard deviation of 350 kilowatt hours. Determine the standard error of the mean. b. With a 0.97 probability, determine the margin of error

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