Discrete Random Variables

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6 Terms

1
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What is the expected value of the discrete random variable X denoted by?

E(X) = ∑xP(X = x)

2
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What is the expected value of the discrete random variable X² denoted by?

E(X²) = ∑x²P(X = x)

3
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What is the variance of the discrete random variable X?

Var(X) = E(X²) - (E(X))²

4
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If X is a random variabe and a and b are constants, then E(aX + b) =

aE(X) + b

5
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If X and Y are random variable then E(X + Y) =

E(X) + E(Y)

6
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If X is a random variabe and a and b are constants, then Var(aX + b) =

a²Var(X)