Question: 4.26 Let X and Y be random variables with joint density function f(x, y) = 4xy, 0 < x, y < 1, 0, elsewhere.

4.26 Let X and Y be random variables with joint density function f(x, y) =



4xy, 0 < x, y < 1, 0, elsewhere.

Find the expected value of Z =

√

X2 + Y 2 .

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