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*Relegated **100.0*Average seed
London Irish 47 London Welsh 28 Yes
-0.1
Northampton 47 Sale Sharks 7 -0.1
Week of 5/4None
Games Above .500
Chance Will Make Playoffs