Let X, Y and Z be three jointly continuous random variables with joint PDF 1. Find the

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Let X, Y and Z be three jointly continuous random variables with joint PDFfxyz(x, y, z) = x+y 0 0x, y, z1 otherwise

1. Find the joint PDF of X and Y.

2. Find the marginal PDF of X.

3. Find the conditional PDF of fXY |Z(x, y|z) usingfxy z(x,y|z) = fxyz(x, y, z) fz(z)

4. Are X and Y independent of Z?

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