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Let X be a distance random variable as...

Let X be a distance random variable assuming values `x_(1),x_(2) ,…….,x_(n)` with probabilities `p_(1),p_(2)…..p_(n) `respectively . The 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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The correct Answer is:
C
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