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Let X, Y, Z and W be random variables which can take the values (+r, -=], (ty, -y), {+=, -z), and {+w, -w} respectively. Given the following joint distribution table: X Y Z W P( X, Y, Z ) +y 0.07 +y 0.07 0.168 0.042 0.07 0.07 0.168 0.042 +y +2 0.027 +V 0.027 -I ty 0.0048 HE 0.0012 0.108 -T. -y 0.108 0.0192 HE. -y 0.0048 (a) (10pts) Use the process of inference by enumeration to calculate P(+z | -y). Show your work for each step in the process