# Math probability question?

Update:

the faces of an 8 sided die are numbered from 1 to 8, what is the probability of rolling a 5 three times in ten rolls?

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- PuzzlingLv 73 years agoFavorite Answer
Use the binomial probability formula.

P(X = k) = C(n,k) * p^k * q^(n-k)

n : number of trials (10)

k : number of successes (3)

p : probability of success (1/8)

q : probability of failure (1-p = 7/8)

P(X = 3) = C(10,3) * (1/8)^3 * (7/8)^7

= 12,353,145 / 268,435,456

About 9.3%

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- Anonymous3 years ago
4

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- Randy PLv 73 years ago
The probability that an event with probability p occurs k times in n trials is given by the binomial distribution.

P(k) = C(n,k) p^k (1 - p)^(n - k)

This is in your textbook.

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