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*Promoted100.0*Average seed
Sharks 6 Montpellier 27 -0.1
Zebre 6 Biarritz 32 -4.1
-0.1
Leinster 33 Scarlets 14 -2.2
-0.0
Saints 18 Castres 12 +1.3
+0.1
Ospreys 15 Tigers 15 -0.1
-0.1
Week of 1/18100.0*Chance in playoffs100.0*Promoted100.0*Average seed
Munster 29 Racing Métro 6 Out
-0.3
Treviso 17 Ospreys 14 +0.5
Games Above .500
Chance Will Make Playoffs