These numbers refer to the gender of the snake.
1.0 = 1 male
0.1 = 1 female
0.0.1 = 1 snake of unknown gender
So 2.5.7 would = 2 males, 5 females, and 7 snakes on unknown gender
Just incase you haven't seen these 2 threads yet I suggest you check them out:
Care: http://ball-pythons.net/forums/showt...ius)-Caresheet
Cage Heating: http://ball-pythons.net/forums/showt...t-Thermometers