Consider the data matrix below. X [ 1 6 8 4 J23 3 6 a) Compute the mean Covariance Vector x x, the and the correlation matrix R matrix. Sn b) Form the given linear combinations to evaluate Covariance the sample means, variances and b'x and of b'x= [111] [ c'x = [1 2 3] X x2 X3 variance- 3] [ x3