If $\mathrm{X}$ is a random variable with the following probability distribution $\begin{array}{|l|c|c|c|}…
If $\mathrm{X}$ is a random variable with the following probability distribution
$\begin{array}{|l|c|c|c|}
\hline \mathrm{X}=x & -3 & 6 & 9 \\
\hline \mathrm{P}(\mathrm{X}=x) & \frac{1}{6} & \frac{1}{2} & \frac{1}{3} \\
\hline
\end{array}$
then the variance of $\mathrm{X}$ is