A fair die is rolled 2 times. Let X1 and X2 denote the number of points showing

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A fair die is rolled 2 times. Let X1 and X2 denote the number of points showing on the first and second rolls, respectively. Let U=X1+X2 and V=X1-X2.
(a)Find the mean and variance of V.
(b)Find the covariance of U and V.
(c)Show that U and V are not independent 

    • 6 years ago
    A fair die is rolled 2 times. Let X1 and X2 denote the number of points showing
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