Sum of Two DiceDate: 12/05/2001 at 00:30:05 From: Emily Sharp Subject: Probability of dice I know I learned the probability of rolling certain numbers with two dice last year, but I don't have my book any more and I need the figures for a project I'm doing. Is there any way you could hook me up with those numbers? Thanks Coding in College Date: 12/05/2001 at 00:36:56 From: Doctor Jeremiah Subject: Re: Probability of dice Hi Emily, Here is how you would figure that out: The sum of two dice: 1 2 3 4 5 6 +------------------- 1 | 2 3 4 5 6 7 2 | 3 4 5 6 7 8 3 | 4 5 6 7 8 9 4 | 5 6 7 8 9 10 5 | 6 7 8 9 10 11 6 | 7 8 9 10 11 12 Notice that there are 36 different combinations for the sum of the two dice in that table. Probability is the number of times something happens divided by the number of times it could happen. Take the sum of 7. It appears in the table six times, but there are 36 spots it could have been in, so the probability is the number of time it happened (6) divided by the number of times it could happen (36), or a probability of 6/36. To find probabilities for different sums, find the number of times a sum appears divided by the number of spots where it could have appeared (36). - Doctor Jeremiah, The Math Forum http://mathforum.org/dr.math/ |
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