Concept explainers
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) | .1 | .2 | .3 | .25 | .15 |
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)? [Hint: This probability equals
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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Chapter 5 Solutions
Probability and Statistics for Engineering and the Sciences
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