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In order to estimate the average electric usage per month, a sample of 64 houses was selected and the electric usage was determined. Assume a population standard deviation of 320 kilowatt-hours. The standard
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In order to estimate the average electric usage per month, a sample of 64 houses was selected and the electric usage was determined. Assume a population standard deviation of 320 kilowatt-hours. The standard error of the mean is a. 400.

b. 40.
c. 320.
d. 64

User Ottavio
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Answer: b

Explanation: 320/the square root of 64

User AdamZ
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