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Let X be a random variable with the following probability distribution: Value x of X P ( X=x) 20 0.40 30 0.30 40 0.20 50

LetX

be a random variable with the following probability distribution:

Valuex ofX P (X=x)

20 0.40

30 0.30

40 0.20

50 0.10

Find the expectationE (X) and varianceVar(X) ofX

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