Probability & Odds

Definition of Odds: The odds of an event occurring is the ratio of the number of ways the event can occur (successes) to the number of ways the event cannot occur (failures).

Odds = successes : failures

For example, out of 25 people, 10 are teens. The odds that a person is a teen would be 10 (successes) to 15 (failures) [Odds (teens)=10:15 or 2:5]


In your math notebook, complete the following questions for probability and odds.