Expected values and variances. Formula For a discrete random variable X and pmf p(X): Expected value: Variance: Alternate formula for variance: Var(x)=E(X^2)-[E(X)]^2.
![Expected values and variances. Formula For a discrete random variable X and pmf p(X): Expected value: Variance: Alternate formula for variance: Var(x)=E(X^2)-[E(X)]^2.](https://static.fdocuments.net/doc/330x215/56649ea95503460f94bacc88/expected-values-and-variances-formula-for-a-discrete-random-variable-x-and.jpg)
