4 3 3. Let XT = [X₁, X2, X3, X4] with mean vector μ = Partition X as X = /X₁ X₂ X3 X4 Let A = (1 2) and B = a. E (X (¹)), E (AX (¹) b. Cov (X (¹), Cov (AX (¹)) c. E (X (2)), E (BX (2)) || = \X(2), and E = 3 0 0 1 2 1 2 0 219 -2 NONT 0 -2 4. (²2 =²) and consider the linear combinations AX(¹) and BX2). Find ²

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