Coach, how did they arrive at using 225 as the standard bench press test?
Yeah, as mentioned it's a nice smaller number that most players can handle for a few, and they don't need much in the way of spotters, equipment.... Also a lot of thought behind it was based on those old 1 rep max charts, they plug in the final number and it gives an idea of their 1 rep.
Granted, it would be better if they chose a different exercise or rep range block for different positions, but the #225 test was late 70's - early 80's thinking.
As far as numbers, many of the smaller positions average 8 - 12 reps. They really look at it for linemen though, a guy only getting in the lower 20's is considered below average.