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Probability help? Eight standard dice are tossed. What is the probability that you turn up three 5s?
Update:
Exactly 3 fives
2 Answers
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- ?Lv 76 years ago
P(5) = 1/6
P(not 5) = 1 - 1/6 = 5/6
Number of ways of getting three 5s out of 8 = 8C3 = 56
Required probability = 56*[1/6]^3*[5/6]^5
= 0.1042
or USE Binomial distribution
P(getting a 5) = p = 1/6
q = 1-p = 1-1/6 = 5/6
n = 8
P(x) = nCx*p^x*q^(n-x)
Required probability = P(x=3) = 8C3*[1/6]^3*[5/6]^5
= 0.1042
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