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For a random variable X, E(X) = 3 and $E (X^{2}) = 11$ . Then variance of X is

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answer is C.

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Detailed Solution

$Var (X) = E (X^{2}) - (E (X))^{2} = 11 - 3^{2} = 2$

$∴$ Option (c) is the correct answer.

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