It says that Washington has done the 45th best job at playing the competition that is on their schedule. It is to be used to try and normalize the schedules of each of the 351 D-1 teams. It is not supposed to be used as RPI 21 v 39 means that 21 should win.

The only numbers in the formula for RPI are the wins and losses of your own team, your opponents and the opponents of your opponents. It takes 0 account of margin of error, pts scored, upsets or anything else. It's designed for one purpose, to determine who does the best with the schedule they have. Not who is the best team.