## Multivariate Analysis

For a random vector $\b{X} = X_1,X_2,X_3,X_4$

I am given only $\bar{\b{X}}$ a 4x1 matrix and $\b{S}$ a 4x4 matrix.

I am asked to find the total mean and variance for $\b{X}$

I know for the variance I need to find $|\b{S}|$ but how do I find the total mean?