Question: A library subscribes to two different weekly news magazines, each of which is supposed to arrive in Wednesdays mail. In actuality, each one may arrive

A library subscribes to two different weekly news magazines, each of which is supposed to arrive in Wednesday’s mail. In actuality, each one may arrive on Wednesday, Thursday, Friday, or Saturday. Suppose the two arrive independently of one another, and for each one ,

, , and . Let of days beyond Wednesday that it takes for both magazines to arrive (so possible Y values are 0, 1, 2, or 3). Compute the pmf of Y. [Hint: There are 16 possible outcomes; , , and so on.]

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