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An American Society of Investors survey found 30% of individual investors have used a discount broker. In a random sample of nine individuals, what is the probability:(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? (Round your answer to 3 decimal places.) Probability