8. (10%) Let denote the mean of a random sample of size 128 from a gamma distribution with a = 2 and β = 4. ApproximateP(7＜＜9).
阿摩線上測驗
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denote the mean of a random sample of size 128 from a gamma distribution with a = 2 and β = 4. ApproximateP(7＜＜9).