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Let x be a random variable with the following probability distribution: Value x of X -2 - 1 0 0 0 1 0 P(X-X) 0.10 .30 .20 .40

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Answer #1
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

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Answer #2

"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"






answered by: sania
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