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*Chance in playoffs100.0*Heineken Cup Berth100.0*Average seed
Agen 23 Perpignan 15 In
Yes
+0.1
Bayonne 32 Montpellier 26 -7.6
-7.6
-0.6
Castres 44 Mont-de-Marsan 17 -0.0
Paris 19 Racing Métro 16 +0.2
Week of 5/4100.0*Chance in playoffs100.0*Heineken Cup Berth100.0*Average seed
Racing Métro 29 Castres 28 -0.3
Montpellier 50 Perpignan 22 +0.1
Games Above .500
Chance Will Make Playoffs