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Probability Stated as Odds
Probability Stated as Odds.
Given a probability P(E),
Odds for E = P(E)/[1 − P(E)].
Given odds for E of “a to b,” the implied P(E) is a/(a + b).
Odds against E = [1 − P(E)]/P(E)
Given odds against E of “a to b,” the implied P(E) is b/(a + b).
If P(E) = 1/8, the odds for E are (1/8)/(7/8) = (1/8)(8/7) = 1/7, or “1 to 7.”
In wagering, for odds of “15 to 1” against E a $1 wager on E, if successful, returns $15 in profits plus the $1 staked in the wager. We can calculate the bet’s anticipated profit as follows:
Win: Probability = 1/16; Profit =$15
Loss: Probability = 15/16; Profit =–$1
Anticipated profit = (1/16)($15) + (15/16)(–$1) = $0
[PRACTICE PROBLEMS] If the probability that Zolaf Company sales exceed last year’s sales is 0.167, the odds for exceeding sales are closest to:
A. 1 to 5.
B. 1 to 6.
C. 5 to 1.
[Solutions] A
Given odds for E of a to b, the implied probability of E = a/(a + b).
Stated in terms of odds a to b with a = 1, b = 5, the probability of E = 1/(1 + 5) = 1/6 = 0.167. This result confirms that a probability of 0.167 for beating sales is odds of 1 to 5.
The Total Probability Rule:not-S,the two-quarter period in total.rulejoint probability of both A and B occurring is PAB = PAPB.
Probability:Random:variable:a quantity whose outcomes possible values;An event is a specified set of outcomes.:timeObjectiveprobability draws on personal or subjective judgment.
Probability Stated as Odds:Odds against E = [1 − PE]PE,if:successful;calculate the bet’s anticipated profit as follows:Win,Lossprobability of 0.167 for beating sales is odds of 1 to 5.
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