In a semiconductor manufacturing process, three wafers from a lot are tested. Each wafer is classified as pass or fail. Assume that the probability that a wafer passes the test is 0.8 and that wafers are independent. (a) What is the formula for the probability mass function? (b) Determine the probability mass function value (up to 3 decimal place) of the number of wafers from a lot that pass the test. X = x P(X - x) 0.008 0.096 0.384 0.512 (c) The cumulative distribution function of the number of wafers from a lot that pass the test are shown below. Determine the values of a to e (up to 3 decimal place a = 0