18. Suppose X and Y are random variables with E (X²) = 53 E (X) = 2 E (Y) = 3 E (Y²) = 45 E (XY) = -21 (a) Find V (X) (b) Find V (Y) (c) Find Cov(X, Y) (d) Find V (2X – 3Y)

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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18. Suppose X and Y are random variables with
E (X) = 2
E (Y) = 3
E (X*) = 53
E (Y*) = 45
E (XY) = -21
(a) Find V (X)
(b) Find V (Y)
(c) Find Cov(X, Y)
(d) Find V (2X –- 3Y')
Transcribed Image Text:18. Suppose X and Y are random variables with E (X) = 2 E (Y) = 3 E (X*) = 53 E (Y*) = 45 E (XY) = -21 (a) Find V (X) (b) Find V (Y) (c) Find Cov(X, Y) (d) Find V (2X –- 3Y')
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