A certain market has both an express checkout line and a superexpress checkout line. let x1 denote the number of

a certain market has both an express checkout line and a superexpress checkout line. let x1 denote the number of customers in line at the express checkout at a particular time of day, and let x2 denote the number of customers in line at the superexpress checkout at the same time. suppose the joint pmf of x1 and x2 is as given in the accompanying table.

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