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briitt2k11 Group Title

Find the probability. A die is rolled 20 times and the number of twos that come up is tallied. Find the probability of getting exactly five twos. A. 0.129 B. 0.921 C. 0.003 D. 0.083

  • 2 years ago
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  1. satellite73 Group Title
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    binomial prob for this one \[P(X=k)=\dbinom{n}{k}p^k(1-p)^{n-k}\] in your example \(n=20,k=5,p=\frac{1}{6},1-p=\frac{5}{6}\)

    • 2 years ago
  2. satellite73 Group Title
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    your answer is therefore \[\dbinom{20}{5}(\frac{1}{6})^5(\frac{5}{6})^{15}\]

    • 2 years ago
  3. satellite73 Group Title
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    http://www.wolframalpha.com/input/?i=20+choose+5+%281%2F6%29^5%285%2F6%29^15

    • 2 years ago
  4. briitt2k11 Group Title
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    wats the answer

    • 2 years ago
  5. satellite73 Group Title
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    i sent it to you

    • 2 years ago
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