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
Ospreys 15 Tigers 15 -0.8
+0.1
Saints 18 Castres 12 +4.9
+0.3
Zebre 6 Biarritz 32 -2.0
-0.1
Leinster 33 Scarlets 14 -1.0
-0.0
Ulster 23 Glasgow 6 +0.2
Week of 1/18100.0*Chance in playoffs100.0*Promoted100.0*Average seed
Treviso 17 Ospreys 14 Out
-0.5
Munster 29 Racing Métro 6 +0.3
Games Above .500
Chance Will Make Playoffs