Well as u all know there is the scale ratings on the person's talent at level making, 1- being worst (example from Radium, Voldard's Treasure Jungle)
and 10 being the best, and 5 is average

Ive always thought of it as percentages

1=10%
2=20%
3=30%
4=40%
5=50% (they say lvl 5 is average)
6=60%
7=70%
8=80%
9=90%
10=100%

*waits for critisism from admins and violet *

Edit: Embarrasing grammer edit pointed out by Radium