possibilities of the Chaos Scroll

I'm not certain that's right, Fiel listed 2 very different methods posted for finding the chaos scrolls.

1) sum (5 of) (30% -1, 40% 0, 30% +1)
2) sum (5 of) (50% +1, 50% +0) * (50% -1, 50% +1)

In the second case it will come out with +2, +3, -2, -3 most often, and 0, +5, -5 least often, with the fractions as Harrisonized said.

In the first case, it's more like
+5 .24%
+4 1.6%
+3 5.5%
+2 12.2%
+1 19.2%
0 22.3%
-1 19.2%
-2 12.2%
-3 5.5%
-4 1.6%
-5 0.24%

And I have to say these probabilities fit a lot better with my observed rate of item finding. The middle -1 0 +1 takes care of the majority of weapons (3/5) and +5s are very very rare.

This would underline my experience with passing the scroll without adding or removing stats.
So to draw a conclusion. good Chaos scrolling is way harder than i thought.