A research team inspects 300 batteries manufactured by two companies to find out whether the batteries are good or defective. The following table gives the two way classification of these batteries.
Good Defective
Company A 140 10
Company B 130 20
(a) The team selects one battery randomly from these 300 batteries. Find the probability that this battery is defective
(b) Are the events "company A" and "defective" are mutually exclusive?
(c) Are these events "good" and "company A" independent? Why?