How are these numbers calculated?

Big Games

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

Week of 1/11100.0*Chance in playoffs100.0*Average seed
Saints 18 Castres 12 +0.2
+1.1
Ulster 23 Glasgow 6 +0.0
Week of 1/18100.0*Chance in playoffs100.0*Average seed
Castres 8 Ulster 9 +0.1
Saracens 40 Edinburgh 7 -0.0
Games Above .500
Chance Will Make Playoffs