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Mathematics - Sample Means and Combinations

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At the downtown office of First National Bank there are five tellers. Last week the tellers made the following number of errors each: 2, 3, 5, 3, and 5.
a. How many different samples of 2 tellers are possible?

b. List all possible samples of size 2 and compute the mean of each.

c. Compute the mean of the sample means and compare it to the population mean.

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