1. The General Social Survey asked a sample of adults how many siblings (brothers and sisters) they had (X) and also how many children they had (Y). We show results for those who had no more than 3 children and no more than 3 siblings. Assume that the joint probability mass function is given in the following contingency table. y X 0 1 2 3 0 0.13 0.10 0.07 0.03 1 0.12 0.16 0.08 0.04 2 0.02 0.06 0.08 0.04 0.01 0.02 0.03 0.01 3

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