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Dragon #39	-	1st Edition AD&D	-	Dragon magazine

In the last three years I have had approximately 220 characters in
D&D. Never once have I rolled one with 18 Strength. I have always
thought this odd until I did a little mathematics. These charts are what I
came up with.

Column A tells you what your chances are of getting that score or
lower and the percentage of the populace with that score or lower.
Column B tells you what your chances are of getting that score or
higher and the percentage of the populace with that score or higher.
Column C tells you the average number of times you will roll each
number out of 216 rolls. Column D is the percentage chance of rolling
each score.
 

Ability score	A	B	C	D
3	0.46%	100%	1	0.46%
4	1.9%	99.5%	3	1.4%
5	4.6%	98.1%	6	2.8%
6	9.3%	95.4%	10	4.6%
7	16.2%	90.7%	15	6.9%
8	25.9%	83.8%	21	9.7%
9	37.5%	74.1%	25	11.6%
10	50%	62.5%	27	12.5%
11	62.5%	60%	27	12.5%
12	74.1%	37.1%	25	11.6%
13	83.8%	25.9%	21	9.7%
14	90.7%	16.2%	15	6.9%
15	95.4%	9.3%	10	4.6%
16	98.1%	4.6%	6	2.8%
17	99.5%	1.9%	3	1.4%
18	100%	0.46%	1	0.46%