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March 25, 2017

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Question: It was discovered that 1 outa every 5 selected adults visits disney world every year. If 30 adults are randomly selected what is the probability that exactly 7 of them will visit disney this year?
answer: .154 BUT I CANNOT FIGURE HOW THEY CAME UP WITH THIS ANSWER.. PLEASE HELP!

  • math - ,

    C(30,7)(1/5)^7(4/5)^23 = .15382

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