Suppose that a college determines the following distribution for X = number of courses taken by a full-time student this semester.

Value of X

3

4

5

6

Probability

0.07

0.25

0.28

What is the standard deviation of the number of courses full-time students at this college take this semester? Must show calculations.

A)

0.89 classes

B)

0.94 classes

C)

1 class

D)

23.36 classes