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Please show the formulas used and explain X~ N(0.5, 1.1) X2~ N(-0.2, 0.5) X3 ~ N(-0.2, 0.5) Find variance and mean u, o for portfolio

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Please show the formulas used and explain

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X~ N(0.5, 1.1) X2~ N(-0.2, 0.5) X3 ~ N(-0.2, 0.5) Find variance and mean u, o for portfolio (X1 + X2 + X3)~N(M, 62)

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