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Mean and standard deviation for 10 and for 12 policies

In fact, the insurance company sees that in the entire population of homeowners, the mean loss from ?re is μ = $300 and the standard deviation of the loss is σ = $400. What are the mean and standard deviation of the average loss for 10 policies? (Losses on separate policies are independent.) What are the mean and standard deviation of the average loss for 12 policies?

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