5. 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.