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Cashiers at Parker Grocery Store

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There are five cashiers at the Parker Grocery Store. Last year the cashiers made the following number of errors each: 2, 3, 5, 3 and 5.
a. How many different samples of size two cashiers are possible?
b. List all possible samples of size two and compute the mean of each.
c. Compute the mean of these sample means and compare it with the population mean.

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