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Let 'X' be a discrete random variable as...

Let 'X' be a discrete random variable assuming values `x_1, x_2, .........x_n` with probabilities `p_1, p_2,........., p_n` respectively. Then variance of 'X' is given by :

A

`E(X^2)`

B

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

C

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

D

`sqrt(E(X^2)-{E(X)^2})`

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