A restaurant chain is planning to purchase 20 ovens from a manufacturer, provided that these ovens pass a detailed inspection. Five ovens are selected at random for inspection. Unknown to the inspectors, there are four defective ovens in the batch of 20 ovens. Express your answers to four decimal places. [15 pts.] (a) What is the proability that no ovens in the sample are defective? (b) What is the probability that one oven in the sample is defective? (c) What is the probability that more than one oven in the sample is defective