MathProbabilityRandom variables and their properties

Variance of a random variable

Choose the correct formula for variance

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The formula to calculate the variance $\operatorname{Var}(X)$ of a continuous random variable 'X' is:

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​Var(X)=\int_{-\infty}^{+\infty}​ xf(x)dx−E(X)​

Var(X)=\int_{-\infty}^{+\infty} x ^2 f(x)dx−E(X)​

​Var(X)=\int_{-\infty}^{+\infty} ​ xf(x)dx−(E(X)) ^2

​Var(X)=\int_{-\infty}^{+\infty} ​ x ^2 f(x)dx−(E(X)) ^2

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