#9 What's the probability that the part is defective? Three machines A, B, and C-are used to produce a large quantity of identical parts at a factory. Machine A produces 60% of the parts, while Machines B and C produce 30% and 10% of the parts, respectively. Historical records indicate that 10% of the parts pro- duced by Machine A are defective, compared with 30% for Machine B and 40% for Machine C. Suppose we randomly select a part produced by one of these three machines at random.