A certain facility produces drill bits which are made of eit…

A certаin fаcility prоduces drill bits which аre made оf either steel, cоbalt, or diamond. Suppose that 60% of the drill bits are steel, 25% are cobalt, and 15% are diamond. Further, suppose that 10% of the steel drill bits fail, 5% of the cobalt drill bits fail, and 1% of the diamond drill bits fail. What is the probability that a drill bit fails?