I need help with this problem please.

Students in a class take a quiz with eight questions. The number x of questions answered correctly can be approximated by the following probability distribution. Complete parts(a) through(e).

x 0 1 2 3 4 5 6 7 8

P(x) 0.02 0.02 0.06 0.05 0.11 0.22 0.28 0.16 0.08

(a) Use the probability distribution to find the mean of the probability distribution.

=

(Round to the nearest tenth asneeded.)

(b) Use the probability distribution to find the variance of the probability distribution.

sigma squared

2=