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13. Five gentlemen went to Molesky's restaurant for all-you-can-eat wings. Mr. Andreasen ate 6 wings, Mr. Betz ate 24 wings, Mr. Henricksen ate 18 wings, Mr. Osters ate 20 wings, and Mr. Tyson ate 32 wings. (a) List all 10 possible SRSs of size n = 2, calculate the mean number of wings eaten for each sample, and display the sampling distribution of the sample mean on a dotplot. (b) Is the sample mean an unbiased estimator of the population mean? Justify your answer. (c) If we increase the sample size, does the variability of the sampling distribution change? Explain