Consider the following data:

19 10 9 8 14 11 11 12 11 9 19 19

17 10 13 18 16 17 5 14 11 15 18 12

8 7 10 16 2 12

What is the number of classes?

A)6

B)5

C)7

D)4

C) 7

There are 7 distinct numbers in the data set: 2, 5, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19.