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If $m$ and $\sigma^2$ are the mean and variance of the random variable X, whose distribution is given by: X=x: 0 1 2 3 P(X=x): 1/3 1/2 0 1/6 then:

$(1)\;m=\sigma ^2=2 \\ (2)\;m=1,\sigma ^2=1 \\ (3)\;m=\sigma ^2=1 \\ (4)\;m=2,\sigma ^2=1 $

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(3) $m=\sigma ^2=1$
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