Let X denote the number of Canon SLR cameras sold during a particular week by a certain store. The pmf of X is x 0 1 2 3 4
pX(x) 0.1 0.2 0.3 0.25 0.15
Sixty-five 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.