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What is the expected value of the discrete random variable X denoted by?
E(X) = ∑xP(X = x)
What is the expected value of the discrete random variable X² denoted by?
E(X²) = ∑x²P(X = x)
What is the variance of the discrete random variable X?
Var(X) = E(X²) - (E(X))²
If X is a random variabe and a and b are constants, then E(aX + b) =
aE(X) + b
If X and Y are random variable then E(X + Y) =
E(X) + E(Y)
If X is a random variabe and a and b are constants, then Var(aX + b) =
a²Var(X)
