Need solution for Just d).

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1 . Suppose we '3) he 1) (a) Calculate AB. {12:} Calculate BA. (c) Compare your answers in (a) and (1)). Are the}.r the same? Should the}r be the same? (d) Suppose X is a random variable with mean p. and variance :12. Cal- culate the mean vector and variance matrix of the random vector Y = (X, 2 + 3X }