2d5
2d5 refers to rolling two five-sided dice and adding the results. Each die is a fair polyhedral die with faces labeled 1 through 5. Five-sided dice exist in various shapes, commonly pentagonal trapezohedra, and they are used in some tabletop games and probability exercises. While not as ubiquitous as 2d6, 2d5 is a valid and used dice combination in systems that employ d5s or need a small, non-uniform range of outcomes.
The possible sums with two fair d5s range from 2 to 10. The number of combinations that
Statistical properties: the expected value (mean) of a single d5 is 3, so the expected sum of
In practice, 2d5 is used in some game systems and probability demonstrations where a modest, non-uniform range