Let X denote the number of Canon SLR cameras sold during a particular week by a certain store. The pmf of X is Sixty percent of all customers who purchase these cameras also buy an extended warranty. Let Y denote the number of purchasers during this week who buy an extended warranty.

a. What is P(X = 4, Y = 2)?
b. Calculate P(X = Y).
c. Determine the joint pmf of X and Y and then the marginal pmf of Y.

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0 4 Pr(x).1 .2 32515