If X be a random variable taking values ...

If X be a random variable taking values `x_(1),x_(2),x_(3),….,x_(n)` with probabilities `P_(1),P_(2),P_(3)`,…..`P_(n)`, respectively. Then, Var (x) is equal to …….. .

`E(X^(2))`

`E(X^(2))+E(X)`

`E(X^(2))-[E(X)]^(2)`

`sqrt(E(X^(2))-[E(X)]^(2))`

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