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Unformatted text preview: #2 also being green is now 70%. Let A = light #1 is green and B = light #2 is green. Are A and B independent? a. Yes b. No c. Not enough information to tell 6. If two events are disjoint, they cannot occur at the same time. a. True b. False 7. If A and B are independent, then you can show that P(A and B) = P(A)+P(B)-P(A)*P(B) a. True b. False 8. Suppose 95% of students have some sort of portable electronic device. You sample two students at random. What is the chance that exactly one of them owns an electronic device? a. .95 b. .95 x .95 c. .95 x .05 d. .95 x .05 x 2 For problems 9 and 10: Suppose 75% of all supermarkets sell books. You randomly select 10 supermarkets. 9. What is the chance that at least one of them sells books? a. 1-.75 10 b. .75 10 c. .25 10 d. None of the above 10. The events A = at least one supermarket sells books and B = at most one supermarket sells books are complements of each other. a. Yes b. No...
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- Fall '07