shayuripatel
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Suppose that we are given random variables X, Y for which we know the means μ X, μ Y and the variances σ2X, σ2Y. Which of the following quantities could we not compute without knowing some additional information about X, Y?
a. σ X+Y
b. μ 3X - 2Y
c. μ X - Y

Sagot :

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