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Given here is the joint probability function associated with data obtained in a study of automobile accidents in which a child (under age 5 years) was in the car and at least one fatality occurred. Specifically, the study focused on whether or not the child survived and what type of seatbelt (if any) he or she used. Define X1 = 0 if the child survived 1 if not, and X2 = 0 if no belt used, 1 if adult belt used, 2 if car-seat belt used. Notice that X1 is the nu