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?

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. 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?

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