When calculating a probability, we are comparing the number of positive outcomes to the number of possible outcomes. Calculating the odds O of an event occurring, however, is the ratio of positive outcomes to negative outcomes.
O=Positive Outcomes/Negative Outcomes
Now we can look at the spinner and find the number of positive and negative outcomes.
On the spinner we have numbers from 1 to 6.
1, 2, 3, 4, 5, 6
We want to find the odds in favor of an even number. Therefore, the number of positive outcomes is equal to the number of parts with even integers on the spinner. The number of negative outcomes is the number of all parts with not even integers, so those numbered with odd values.
1, 2, 3, 4, 5, 6
Now we know how many outcomes are positive and negative.
Positive:& 3even
Negative:& 3odd
Let's form our ratio and then simplify it as much as possible.
