A manufacturer of clothing knows that the probability of a button flaw (broken, sewed on incorrectly, or missing) is 0.004. An inspector examines 42 shirts in an hour, each with 4 buttons. Using a Poisson probability model, answer parts a and b below. a) What is the probability that she finds no button flaws? The probability that the inspector finds no button flaws is (Round to three decimal places as needed.) b) What is the probability that she finds at least one? The probability that the inspector finds at least one flaw is (Round to three decimal places as needed.)