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anonymous
 4 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
anonymous
 4 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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anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0binomial prob for this one \[P(X=k)=\dbinom{n}{k}p^k(1p)^{nk}\] in your example \(n=20,k=5,p=\frac{1}{6},1p=\frac{5}{6}\)

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0your answer is therefore \[\dbinom{20}{5}(\frac{1}{6})^5(\frac{5}{6})^{15}\]

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0http://www.wolframalpha.com/input/?i=20+choose+5+%281%2F6%29^5%285%2F6%29^15
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