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Suppose that a claim is made that the average billionaire is 60 years old or younger.The following is a random sample of billionaires' ages, 80, 70, 76, 54, 59, 52, 74, 64, 76, 67, 39, 67, 43, 62, 57, 91, 55.
Conduct the test using the 0.05 level of significance.

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