The following question needs answering. Please help. Make sure to include a tree diagram.
Two factories manufacture computer memory chips. Suppose that 20% of the chips from Factory I are defective and that 5% of the chips from Factory II are defective. Each week Factory I produces four times as many chips as Factory II. It is important to use a tree diagram.
(a) What is the probability that a randomly selected chip is satisfactory?
(b) What is the probability that a randomly selected chip is defective?
(c) Given that the chip is defective, what is the probability that it came from Factory I?