Fuel Consumption and Cars A small tool-and-die shop manufactures kneuter valves. A shipment of 15 valves to a Swedish automobile assembly plant contains three defective values. Suppose the assembly plant randomly selects four valves from the shipment.
a. What is the probability that all four valves will be defect-free?
b. What is the probability that the plant will select all three defectives?
c. What is the probability that the plant will select at least one defective?