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 x_{i} is the value of random variable and p_{i} 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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