Let X,Y ,Z and Be Random Variables with Joint Probability $$f ( x ) = \left\{ \begin{array} { l l } 8 x y z & 0 < x < 1,0 < y < 1,0 < z < 1 \\0 & \text { else. }\end{array} \right.$$

Let X,Y ,Z and be random variables with joint probability density function $$f ( x ) = \left\{ \begin{array} { l l } 8 x y z & 0 < x < 1,0 < y < 1,0 < z < 1 \\0 & \text { else. }\end{array} \right.$$ Find P(Z