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A random variable has the following distribution :
\begin{tabular}{|c|c|c|c|c|}
\hline \( \mathrm{X}: \) & \( -1 \) & 0 & 1 & 2 \\
\hline \( \mathrm{P}(\mathrm{X}): \) & \( \frac{1}{3} \) & \( \frac{1}{6} \) & \( \frac{1}{6} \) & \( \frac{1}{3} \) \\
\hline
\end{tabular}
If yes, find its mean and variance.
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