Math — Expectation & Variance
Mean and variance of a discrete random variable.
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E[X] = \sum x_i p_i
\operatorname{Var}(X) = E[X^2] - (E[X])^2
E[aX + b] = aE[X] + b
\operatorname{Var}(aX + b) = a^2\operatorname{Var}(X)
Mean and variance of a discrete random variable.
E[X] = \sum x_i p_i
\operatorname{Var}(X) = E[X^2] - (E[X])^2
E[aX + b] = aE[X] + b
\operatorname{Var}(aX + b) = a^2\operatorname{Var}(X)