Question: 4. Let the joint probability density function of X, Y, and Z be given by (a) Find the marginal joint probability density function of X,

4. Let the joint probability density function of X, Y, and Z be given by

6e-2-y-z f(x, y, z) = if 0

(a) Find the marginal joint probability density function of X, Y ; X, Z; and Y, Z.

(b) Find E(X).

6e-2-y-z f(x, y, z) = if 0

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