Both random and points-based methods for determining stat totals exist, but the final result will be a number on a percentile scale ( 1-100 ), which is then used to determine the character's skill bonus at actions which employ that stat.
2.
Minor modifications of the " BRP " rules were introduced in every one of those games, to suit the flavor of each game's universe . " Pendragon " used a 1-20 scale and 1d20 roll instead of a percentile scale and 1d100.