[dumbluck]

From settings.txt:

Random Player Personality Groups := 4
Random Player Personality Group 1 Percent := 30
Random Player Personality Group 2 Percent := 30
Random Player Personality Group 3 Percent := 30
Random Player Personality Group 4 Percent := 10

I take this to mean that of the total # of random AIs, 30% will be from Personality Group 1, 30% will be from Personality Group 2, 30% will be from Personality Group 3, and 10% will be from Personality Group 4.

Just my very over-priced $0.02 worth.