MathProbabilityRandom variables and their properties

Variance of a random variable

Choose the correct formula for variance

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Which of the following is the formula to calculate the variance $\operatorname{Var}(X)$ of a discrete random variable 'X'?

Select one option from the list

Var(X)=∑x _i^2 ​ p _i ​ −(E(X)) ^2

​Var(X)=∑x _i^2 ​ p _i ​ −E(X)​

Var(X)=∑x_ i^2 ​ p _i^2 ​ −(E(X)) ^2

Var(X)=∑x _i ​ p _i^2 ​ −(E(X)) ^2

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