SOLUTION: A research organization decides to mail 9 questionnaires to people selected at random. If the probability of anyone answering the questionnaire is 1/7, find the probability that ex

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Question 1140289: A research organization decides to mail 9 questionnaires to people selected at random. If the probability of anyone answering the questionnaire is 1/7, find the probability that exactly 5 will answer the questionnaire.
Answer by ikleyn(52923) About Me  (Show Source):
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Probability  P = C%5B9%5D%5E5%2A%281%2F7%29%5E5%2A%286%2F7%29%5E4 = %28%289%2A8%2A7%2A6%29%2F%281%2A2%2A3%2A4%29%29%2A%281%2F7%29%5E5%2A%286%2F7%29%5E4 = 0.004047 = 0.4047%.