Please help me these questions. I just need ABC (but if it is feasible, plz give me "short" calculations) Please do it as carefully as possibleThanks so much!

Use the following information to solve problems 15-17 A student organization had sold sweatshirts to the students at a college. Results are shown below: Number of sweatshirts Number of students O 2 1-5 13 6-10 8 11-15 4 16-20 4 20+ One student who had purchased sweatshirts from this organization is chosen at random. 15. The probability that the organization sold this student at least 16 sweatshirts is: A. 0.156 B. 0.844 C. 0.165 16. The probability that the organization sold this student at most 5 sweatshirts is: A. 0.063 B. 0.469 C. 0.531 17. The probability that the organization did not sell any sweatshirt to this student is: A. 0.938 B. 0.844 C. 0.063