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Question 2 A public utility noted that the monthly electricity usage (measured in kilowatt-hours) by certain residential users is normally distributed with a mean of

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Question 2 A public utility noted that the monthly electricity usage (measured in kilowatt-hours) by certain residential users is normally distributed with a mean of 1040. 2.1 If the monthly electricity usage of a sample of 15 randomly selected users yielded a variance of 6500, what is the probability that their mean electrical usage exceeds 1100? 2.2 Suppose the public utility also noted that the monthly electricity usage by residential users has a population standard deviation of 78. Find the probability that the average monthly electricity usage for 35 randomly selected users does not exceed 1080

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