Maths problem: fatigue vs critical hits

[cleveland]

Today's my day off, so I'm in no mood to derive or explain this result, but some quick fun with Excel yielded the following:

X.......Chance that 2d6oe > X
2.......0.972
3.......0.917
4.......0.833
5.......0.722
6.......0.583
7.......0.463
8.......0.361
9.......0.278
10......0.213
11......0.167
12......0.127
13......0.095
14......0.069
15......0.051
16......0.039
17......0.030
18......0.022

The values then slowly approach zero.

I invite everyone to cross-check my result, as I've been drinking for the last hour.

Edit: cleaned up the table, apparently the forums don't like TAB