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 -0.1
-1.7
-0.0
Toulouse 35 Treviso 14 -0.1
-0.1
Leinster 33 Scarlets 14 -5.5
-0.2
Zebre 6 Biarritz 32 -4.0
-0.1
Ulster 23 Glasgow 6 +1.9
+0.1
Saints 18 Castres 12 +1.8
+0.1
Quins 47 Connacht 8 +0.1
Week of 1/18100.0*Chance in playoffs100.0*Promoted100.0*Average seed
Treviso 17 Ospreys 14 Out
-0.2
Munster 29 Racing Métro 6 +0.2
Games Above .500
Chance Will Make Playoffs