Question: 9. fY (y) = 1 4 (3y + 1)ey for 0 < y < . 11. Use Theorem 6.62 with g(x, y) = p x2

9. fY (y) = 1 4 (3y + 1)e−y for 0 < y < ∞.

11. Use Theorem 6.62 with g(x, y) =

p x2 + y2 and change to polar coordinates. The variance equals σ2(2 − 1 2π).

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