Page 101 - Probability Demystified

90 CHAPTER 5 Odds and Expectation

5. On a roulette wheel, there are 38 numbers: 18 numbers are red, 18
numbers are black, and 2 are green. What are the odds in favor of
getting a red number when the ball is rolled?
a. 19 : 9
b. 9 : 10
c. 10 : 9
d. 9 : 19
6. If the odds in favor of an event occurring are 3:5, what are the odds
against the event occurring?
a. 5:3
b. 2:5
c. 5:8
d. 8:5
7. If the odds against an event occurring are 8:3, what are the odds in
favor of the event occurring?
a. 3:8
b. 11:3
c. 11:8
d. 8:5

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8. The probability of an event occurring is . What are the odds in favor
13
of the event occurring?
a. 8:5
b. 13:5
c. 5:13
d. 5:8

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9. The probability of an event occurring is . What are the odds against
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the event occurring?
a. 5:12
b. 12:5
c. 5:7
d. 7:5
10. What are the odds for a fair game?
a. 0:0
b. 1:1
c. 2:1
d. 1:2