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 +13.9
+0.1
Edinburgh 17 Munster 26 -2.8
-0.0
Toulouse 35 Treviso 14 +1.7
+0.1
Ospreys 15 Tigers 15 +0.6
Ulster 23 Glasgow 6 +0.5
Sharks 6 Montpellier 27 -0.1
Week of 1/18100.0*Chance in playoffs100.0*Average seed
Tigers 9 Toulouse 5 -0.8
-1.0
Saracens 40 Edinburgh 7 +0.7
Munster 29 Racing Métro 6 -0.5
Games Above .500  (Full Screen)
Chance Will Make Playoffs  (Full Screen)