Suppose that it is known that 5% of the items produced by a particular machine are defective in some way, and that we will choose a random sample of exactly 15 parts made by this machine. a. What proportion of this machine's output is non-defective? b. What is the expected number of non-defective items, out of the 15 we select? c. What is the probability that exactly 3 of the 15 items is non-defective? d. What is the probability that no more than 2 out of the 15 items selected are non-defective?