Dice notation
2d280
- 2d280
- 2 to 560
- mean 281
- mode 281
Rolling 2d280 gives a total between 2 and 560, with a mean of 281 and a standard deviation of 114.3088. There are 78,400 equally likely ordered outcomes, and the most likely total is 281 at 0.357%.
The roll
Notation2d280
Dice2
Faces per die280
Minimum total2all 2 dice showing 1
Maximum total560all 2 dice showing 280
Distinct totals559
Mean281n(f + 1)/2 + modifier, exact
Variance13,066.5n(f² − 1)/12, exact
Standard deviation114.30879231≈
Counting the outcomes
Ordered outcomes78,400280^2, every die distinguishable
Most likely total281
Chance of that total0.357143%≈
Ways to roll it280exact count
Chance of the minimum0.00127551%≈1 in 78,400
Chance of the maximum0.00127551%≈1 in 78,400
Shape of the distribution
559 distinct totals, too many to list individually.
1st percentile41≈1.046% of rolls are this or lower
5th percentile90≈5.108% of rolls are this or lower
25th percentile199≈25.129% of rolls are this or lower
50th percentile281≈50.179% of rolls are this or lower
75th percentile363≈75.124% of rolls are this or lower
95th percentile472≈95.005% of rolls are this or lower
99th percentile521≈99.005% of rolls are this or lower
Chance of rolling at least
5897.9643%≈
14287.4107%≈
28150.1786%≈
42112.5893%≈
5042.1084%≈
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