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The mean outstanding credit card balance distributed normally for young American couples is u = $650 with a standard deviation = $420. In a

The mean outstanding credit card balance distributed normally for young American couples is u = $650 with a standard deviation = $420. In a simple random sample of 100 couples, what is the probability that their mean outstanding credit card balance is more than $800? What is the name of the theorem that allows you to calculate this probability?

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