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5 over 36
Theoretical probability is calculated by taking the number of desired outcomes (in this case, rolling a sum of 8) and dividing it by the total number of possible outcomes when rolling two standard number cubes (6 * 6 = 36).
The number of ways to roll a sum of 8 with two dice is 5: (2,6), (3,5), (4,4), (5,3), (6,2).
So the theoretical probability of rolling a sum of 8 is 5/36.