Answer:
20%
Explanation:
Probability is essentially: (# times a specific event can occur) / (# times any event can occur).
Here, the specific event is choosing a 5 star restaurant, while any event is just choosing a random restaurant. Since there are 3 five-star restaurants, there are 3 ways the specific event can occur. Since there are 7 + 5 + 3 = 15 total new restaurants, there are 15 ways any event can occur. So: 3/15 = 1/5
Convert this to percent by multiplying 1/5 by 100: 1/5 * 100 = 20%
Hope this helps!