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Customers at a fast-food restaurant but both sandwlches and drinks. The joint distributlon on the right summarizes the number of sandwiches (X) and drinks (Y)

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Customers at a fast-food restaurant but both sandwlches and drinks. The joint distributlon on the right summarizes the number of sandwiches (X) and drinks (Y) purchased by customers. Complete parts (a) through ll). (a) Find the expected value and variance of the number of sandwlches. E{X) = :| Var()

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