According to a survey conducted by TD Ameritrade, one out of four investors have exchange-traded funds in their portfolios (USA Today, January 11, 2007). Consider a sample of 20 investors. a. Compute the probability that exactly 4 investors have exchange-traded funds in their portfolios. b. Compute the probability that at least 2 of the investors have exchange-traded funds in their portfolios. C. If you found that exactly 12 of the investors have exchange-traded funds in their port- folios, would you doubt the accuracy of the survey results? d. Compute the expected

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