3.67 A corporation regularly takes deliveries of a particular sensitive part from three subcontractors. It found that the proportion of parts that are good or defective from the total received were as shown in the following table:

a. If a part is chosen randomly from all those received, what is the probability that it is defective?

b. If a part is chosen randomly from all those received, what is the probability it is from subcontractor B?

c. What is the probability that a part from subcontractor B is defective?

d. What is the probability that a randomly chosen defective part is from subcontractor B?

e. Is the quality of a part independent of the source of supply?

f. In terms of quality, which of the three subcontractors is most reliable?

Transcribed Image Text:

Subcontractor Part A B C Good 0.27 0.30 0.33 Defective 0.02 0.05 0.03