#discrete random variables

2 messages · Page 1 of 1 (latest)

wide hamlet Dec 11, 2022, 1:07 PM

So I know the formulas for E(X) and E(X²)
I also know the formula for Var(X) being sigma(p(x) times x²) - Mean²
But what's the formula for Var(x²)

slate flame Dec 13, 2022, 11:11 PM

If you know E(X) and E(X^2), you can calculate Var(X).

Var(X) = E(X^2) - [E(X)]^2