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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
 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
 2 years ago
 2 years ago

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satellite73Best ResponseYou've already chosen the best response.2
binomial prob for this one \[P(X=k)=\dbinom{n}{k}p^k(1p)^{nk}\] in your example \(n=20,k=5,p=\frac{1}{6},1p=\frac{5}{6}\)
 2 years ago

satellite73Best ResponseYou've already chosen the best response.2
your answer is therefore \[\dbinom{20}{5}(\frac{1}{6})^5(\frac{5}{6})^{15}\]
 2 years ago

satellite73Best ResponseYou've already chosen the best response.2
http://www.wolframalpha.com/input/?i=20+choose+5+%281%2F6%29^5%285%2F6%29^15
 2 years ago
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