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Mean and variance of a discrete probability distribution are 3 and 7 respectively. What will be E (X^2) for this distribution ?

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Mean and variance of a discrete probability distribution are 3 and 7 respectively. What will be E (X2) for this distribution ?

(a) 10
(b) 4
(c) 40
(d) 16

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Correct option is (d) 16

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