(Answered) Students in a class take a quiz with eight questions the

Engineering

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=

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