How are these numbers calculated?

Big Games

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

Week of 4/19100.0*Average seed
Dragons 30 Munster 24 +0.1
Treviso 30 Edinburgh 10 +0.0
Week of 4/26None
Week of 5/3100.0*Average seed
Edinburgh 31 Dragons 24 -0.3
Games Above .500
Chance Will Make Playoffs