he probabilities are 0.4, 0.2, 0.3 and 0.1, respectively, that a delegate to a certain convention arrived by air, bus, automobile, or train. (a) Consider 9 randomly selected delegates at this convention. What is the probability that from these 9 delegates, 3 arrived by air, 3 arrived by bus, 1 arrived by automobile, and 2 arrived by train