phins wrote:

The 20-80 scale is based on a normal distribution, and each number up is standard deviations from the mean with a 50 being the mean. So, a 60 is one standard deviation above the mean for that tool, and a 70 being two, etc. etc. where 96% (some say 95%) of all players fall within two standard deviations from the mean.

Harper's power is an 80, so it's in that 4% of players or better. Billy Hamilton is an 80 speed. Ichiro an 80 hit tool. You get the idea.

It's why a player who is all 50's is actually a pretty solid player, and giving a guy a 60 is honestly a solid tool. Anything more is very good.

Thanks. That makes sense to me. To arrive at a single number, like a 60 for Taveras, do they just average out all of his ratings on various tools? Are any weighted more than others? How do they boil it down to one number?