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The Harvard Business School reports that the average annual salary of their graduating class is $225,000 with a standard deviation of $20,000. A report in

The Harvard Business School reports that the average annual salary of their graduating class is $225,000 with a standard deviation of $20,000. A report in the Economist takes a random sample of 100 graduates and finds the average earnings to be $210,000. If the HBS' claims are correct, what is the probability of the sample having an average annual salary that low?

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