Given a dataset consisting of the following vectors x_{1}=[\begin{matrix}1&0&2\end{matrix}]^{T}, x_{2}=[\begin{matrix}0&2&-1\end{matrix}]^{T}, x_{3}=[\begin{matrix}2&-2&2\end{matrix}]^{T} Let S = [si] be the covariance matrix of this dataset. Find $11.
