please help

(A) The probability model for random variable A is 0.4 a = 0, PA (a) = 0.6 a = 2, (4.127) 0 otherwise. The conditional probability model for random variable B given A is 0.8 b = 0, 0.5 b = 0, PBA (b|0) = 0.2 b = 1, PBA (b|2) = 0.5 b = 1, (4.128) 0 otherwise, 0 otherwise. (1) What is the probability model for (2) If A = 2, what is the conditional A and B? Write the joint PMF expected value E[B | A = 2]? PA, B(a, b) as a table. (3) If B = 0, what is the conditional (4) If B = 0, what is the conditional PMF PAB(a|0)? variance Var[ A| B = 0] of A? (B) The PDF of random variable X and the conditional PDF of random variable Y given X are fx (x ) = 3x2 0