Question

 X P(X) X*P(X) (mean - x)^2*P(X) -2 0.1 -0.2 0.361 -1 0.3 -0.3 0.243 0 0.2 0 0.002 1 0.4 0.4 0.484 Total -0.1 1.09

E(x) = -0.1

Var(x) = 1.09

"Find the expectation of a random variable X? if X = 8 ,10, 11, 12, 13, and P(X) = 0.2, 0.25, 0.3, 0.15, 0.1 respectively"

 11.5 10.5 2.5 4.5

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