4, ELY Suppose X and Y are two random variables with E[X] = 1, Var (X) Var (Y) = 4, and Cov (X, Y) = 1. Find the standard deviation of (X - Y). (a) 2 (b) √2 (c) 6 (d) √6 (e) None of the above

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A: 0 \)" data-mce-style="cursor: default;"&gt;f(x)=c(1+x)4;x&gt;0

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Q: (40) Let X be a random variable with p.d.f. (k +4)e-3* f(x) =- 01) O.w

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