A company claims that the mean monthly residential electricity consumption in a certain region is more than 860 kilowatt-hours (kWh). You want to test this claim. You find that a random sample of 60 residential customers has a mean monthly consumption of 900 kWh. Assume the population standard deviation is 125 kWh. At x = 0.01, can you support the claim? Complete parts (a) through (e).

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