You first add all the numbers together. 17+18+15. You get 50. Then, since Jenny baked 15 cookies, (respectively) you take 15 over 50 and times it by 100 to get 30%. I’m pretty sure.
Since the total number of available selections is divided by two, the probability is 50%. If we look at the total set of numbers, we find that even numbers are multiples of 2. 2, 4, 6, 8 (which makes up half of the numbers on the spinner).
