Probability. 6.4. Outcomes. Possible results of an action Examples: 6 outcomes for rolling a dice (1,2,3,4,56) 2 outcomes for flipping a coin (heads or tails). Event. The outcome or group of outcomes. Probability of an Event. Find the probability of rolling one number cube .
Rain and No Rain are complements
ODDs in Favor of an Event
ODDs Against an Event
What are the odds that a quarter chosen at random from the five shows a horse?
1 to 4
What are the odds that it shows no horse?
4 to 1
Consider the event of randomly choosing a quarter that shows the outline of a state.
What are the odds in favor of this event?
2 to 3
What are the odds against the event?
3 to 2