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.
We want to find odds in favor of a multiple of 5, so the number of positive outcomes is equal to the number of parts on the spinner which are numbered with a multiple of 5. To find those multiples, we need to look for the numbers with the last digit of the number being either 0 or 5.
1, 2, 3, 4, 5, 6
The number of negative outcomes is the number of all parts which are not numbered with a multiple of 5.
1, 2, 3, 4, 5, 6
Now we know how many outcomes are positive and negative.
Positive:& 1multiple of5
Negative:& 5not a muliple of5
Let's form our ratio.
