A concerned parents group determined the number of commercials shown in each of five children's programs over a period of time. The probability distribution of these observations is shown below. What is the expected number of commercials during a children's program?

x

5

6

7

8

9

P(x)

0.2

0.25

0.4

0.1

0.05

1. 7
2. 6.55
3. 8
4. 7.5