Brandy asks her 26 classmates where they spent their summer vacations. There were 9 that went to the beach, 6 that went to the mountains, 5 that went on a cruise, and 6 that did not take a vacation. What is the probability of Brandy’s classmates going on vacation this summer?

To find the probability of Brandy's classmates going on vacation this summer, we need to calculate the total number of classmates who went on vacation.

Number of classmates who went on vacation = 9 (beach) + 6 (mountains) + 5 (cruise) = 20

Total number of classmates = 26

Probability of classmates going on vacation = Number of classmates who went on vacation / Total number of classmates
Probability of classmates going on vacation = 20 / 26 = 0.7692

Therefore, the probability of Brandy's classmates going on vacation this summer is approximately 0.7692 or 76.92%.