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briitt2k11

  • 2 years ago

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

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

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

  4. briitt2k11
    • 2 years ago
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    wats the answer

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

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