Question: A social organization of 32 members sold college sweatshirts as a fundraiser. The results of their sale are shown below.

No. of sweatshirts No. of students

1-5 13

6-10 8

11-15 4

16-20 4

20+ 1

Choose one student at random. Find the probability that the student sold.

a. More than 10 sweatshirts.

b. At least one sweatshirts.

c. 1-5 or more than 15 sweatshirts.