Dice notation
2d258
- 2d258
- 2 to 516
- mean 259
- mode 259
Rolling 2d258 gives a total between 2 and 516, with a mean of 259 and a standard deviation of 105.3273. There are 66,564 equally likely ordered outcomes, and the most likely total is 259 at 0.388%.
The roll
Notation2d258
Dice2
Faces per die258
Minimum total2all 2 dice showing 1
Maximum total516all 2 dice showing 258
Distinct totals515
Mean259n(f + 1)/2 + modifier, exact
Variance11,093.83333333n(f² − 1)/12, exact
Standard deviation105.32726776≈
Counting the outcomes
Ordered outcomes66,564258^2, every die distinguishable
Most likely total259
Chance of that total0.387597%≈
Ways to roll it258exact count
Chance of the minimum0.00150231%≈1 in 66,564
Chance of the maximum0.00150231%≈1 in 66,564
Shape of the distribution
515 distinct totals, too many to list individually.
1st percentile37≈1.001% of rolls are this or lower
5th percentile83≈5.112% of rolls are this or lower
25th percentile183≈25.018% of rolls are this or lower
50th percentile259≈50.194% of rolls are this or lower
75th percentile335≈75.255% of rolls are this or lower
95th percentile435≈95.011% of rolls are this or lower
99th percentile481≈99.054% of rolls are this or lower
Chance of rolling at least
5398.0079%≈
13187.4031%≈
25950.1938%≈
38812.5969%≈
4652.0702%≈
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