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From 1975 through 2016, the mean gain of the Dow Jones Industrial Average was 456. A random sample of 32 years is selected from this

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From 1975 through 2016, the mean gain of the Dow Jones Industrial Average was 456. A random sample of 32 years is selected from this population. What is the probability that the mean gain for the sample was between 200 and 500? Assume o = 1215. A sample of 30 diapers yielded a sample average weight of 54.98 g, and the population standard

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