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.
μ=
?(Round to the nearest tenth as? needed.)
?(b) Use the probability distribution to find the variance of the probability distribution.
Sigma squared
σ2=