How are these numbers calculated?

Big Games

How we did last week and who we should root for this week.   Explain

Week of 4/20100.0*Promoted *100.0*Average seed
London Wasps 24 Exeter 37 No
-0.7
Bath 27 Leicester 26 -4.9
-0.3
Gloucester 28 Saracens 23 -0.2
-0.1
Week of 5/4None
Games Above .500
Chance Will Make Playoffs