A baseball player is asked to swing at pitches in sets of four. The player swings at 100 sets of 4 pitches. The probability distribution for making a particular number of hits is given below. Determine the mean for this discrete probability distribution.

x

0

1

2

3

4

P(x)

0.02

0.07

0.22

0.27

0.42

A.

3

B.

3.5

C.

2

D.

4