statistics
posted by lauren .
The number of column inches of classified advertisements appearing on Mondays in a certain daily
newspaper has mean 320 inches and standard deviation 30 inches. Suppose that the results for 100
consecutive Mondays can be regarded as a random sample and let J denote the mean number of column
inches of classified advertisements in the sample. Assuming a sample of 100 is sufficiently large, the
random variable J has a

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