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Probability of Rolling a 5 before a 7
You have 2 fair dice. What is the probability that you roll a 5 before you roll a 7?
I answered it this way, although I am not confident with this answer. On average you will roll a 5 once every ln(2)/ln(9/8)=5.88 tries. I found this by solving (8/9)^x = 1/2 since probability of rolling a 5 is 1/9. I then found the odds of rolling a 7 in approx 5.88 tries which is (5/6)^5.88= 0.342 so the probability of rolling a 5 before a 7 is 34.2% See anything wrong with this? |
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