Convert the Matrix of Observations to Mean-Deviation Form, and Construct $$\mathrm { S } = \left[ \begin{array} { r c } 60 & - 55 \\- 55 & 280\end{array} \right]$$

Multiple Choice

Convert the matrix of observations to mean-deviation form, and construct the sample covariance matrix.
- $$\mathrm { S } = \left[ \begin{array} { r c } 60 & - 55 \\- 55 & 280\end{array} \right]$$

A) $89.7 \%$
B) $82.4 \%$
C) $86.2 \%$
D) $13.8 \%$