Answer:
1/5 or a 20 percent chance
Explanation:
You add all the muffins together and you get 35 muffins. Since there are 7 vanilla muffins, you do 7/35 and you simplify and get 1/5 and that's a 20% chance that the vanilla muffin will be sold.
The probability that the next muffin sold is a vanilla muffin is 1/5
unlikely.