. Consider the arbitrary random vector X = [X1, X2, X3, X4, X5] with mean vector = [1, 2, 3, 4, 5]. Partition X into X = X(1) X(2) where X(1) = X1 X2 and X(2) = X3 X4 X5

Let be the covariance matrix of X with general element ik. Partition into the covariance matrices of X(1) and X(2) and the covariance matrix of an element of X(1) and an element of X(2) .

3. Consider the arbitrary random vector X=[X1,X2,X3,X4,X5] with mean vector =[1,2,3,4,5]. Partition X into X=[X(1)X(2)] where Let be the covariance matrix of X with general element ik. Partition into the covariance matrices of X(1) and X(2) and the covariance matrix of an element of X(1) and an element of X(2)