Let x be a zero-mean random variable having a variance of 9


Let X be a zero-mean random variable having a variance of 9 and let Y be another zero-mean random variable. The sum of X and Y has a variance of 29 and the difference of X and Y has a variance of 21.

(a) Find the variance of Y.

(b) Find the correlation coefficient of X and Y.

(c) Find the variance of U = 3X - 5Y.

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Electrical Engineering: Let x be a zero-mean random variable having a variance of 9
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