Q. 294.6( 14 Votes )

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Answer :

Let X be the number of kings drawn. Then X can be 0,1 or 2.






Sum of probabilities of all possible values of X is equal to 1.


Hence X is a random variable.


The mean of X is defined as, , where xi is the value of random variable and pi is the probability of that value of random variable.


Hence,


The variance of X is defined by the formula , where and .



Hence,


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