Give an algorithm for generating random variables X1, X2, X3 having a multivariate distribution with means E[Xi] = i, i = 1, 2, 3, and covariance matrix. Also find the copula C_{X, X}\begin{pmatrix} 3 & -2 & 1\\ -2 & 5 & 3\\ 1 & 3 & 4 \end{pmatrix}

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

the forst and 3rd

step-by-step explanation: