How are these numbers calculated?

Big Games

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

Week of 1/11None
Week of 1/18100.0*Chance in playoffs100.0*Promoted100.0*Average seed
Saracens 40 Edinburgh 7 In
Yes
+0.1
Castres 8 Ulster 9 -0.1
Games Above .500
Chance Will Make Playoffs