Bell Curves
2d6: How Often A Number Occurs
| Test |
Occurs |
Chances |
Percent |
| 2- |
1 |
1 |
2.78% |
| 3- |
2 |
3 |
8.33% |
| 4- |
3 |
6 |
16.67% |
| 5- |
4 |
10 |
27.78% |
| 6- |
5 |
15 |
41.67% |
| 7- |
6 |
21 |
58.33% |
| 8- |
5 |
26 |
72.22% |
| 9- |
4 |
30 |
83.33% |
| 10- |
3 |
33 |
91.67% |
| 11- |
2 |
35 |
97.22% |
| 12- |
1 |
36 |
100.00% |
Like the 1d6: Roll Succeeds page,
this page shows the chances of rolling a certain total or less.
If you are trying to roll an 8 or less (8-) on 2d6, there are seven
possible totals that would succeed: 2, 3, 4, 5, 6, 7, 8. A total of 9,
10, 11, or 12 would fail the test.
Each of the successful totals occurs differing numbers of times in the table.
Frex, 2 occurs once, 3 occurs twice, etc.
In order to determine the chance of rolling a total of 8-,
we add up all the "chances" for each number that would be a success.
In our example,
this would be the total number of times each total from 2 to 8 occurs:
1+2+3+4+5+6+5,
for a total of 26 possible rolls that would be a success
in the 36 total possible rolls,
26/36 or a 72% chance for any rolled total to be a success.
Copyright © 1999 Bob Simpson. All Rights Reserved.
Last updated: 2001 Nov 29
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