10-7

The odds in favor of an event are the ratio of favorable outcomes to unfavorable outcomes.

The odds against an event are the ratio of unfavorable outcomes to favorable outcomes

A tennis player is in a tournament with 73 other players.

What are the odds in favor and against the player winning the

tournament?

Mary enters a charity lottery. She buys 6 tickets. 540 tickets are sold in total.

What are the odds of Mary winning the lottery?

The odds in favor of a horse winning a race

are 3:7. What is the probability of the horse winning the race?

The odds of a student getting an A on a test are 1:3.

What is the probability of the student getting an A on

the test?

The probability of a contestant winning the grand prize on a

game show is 2/13245. What are the odds in favor and against

the contestant winning prize?

The probability of rolling two dice and getting values that add to 6 is

5/36. What are the odds in favor and against getting values that add

to 6?

10-7

Odds are another way to write probability

4:3

2:1

Converting Probability to Odds

Converting Odds to Probability

If the probability is m/n, then the odds in favor are m:(n-m)

and the odds against are (n-m):m

If the odds are a : b , then the probability is a/( a+b)