An American Society of Investors survey found 30 percent of individual investors have used a discount broker. In a random sample of nine individuals, what is the probability for the following?
(a) Exactly two of the sampled individuals have used a discount broker? (Round your answer to 3 decimal places.) Probability
(b) Exactly four of them have used a discount broker? (Round your answer to 3 decimal places.) Probability
(c) None of them have used a discount broker?