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
Leinster 33 Scarlets 14 +3.8
+0.1
Saints 18 Castres 12 +9.0
+0.3
Zebre 6 Biarritz 32 -2.0
-0.1
Ulster 23 Glasgow 6 +0.3
Week of 1/18100.0*Chance in playoffs100.0*Promoted100.0*Average seed
Chiefs 20 Leinster 29 +0.1
Saracens 40 Edinburgh 7 Out
Tigers 9 Toulouse 5 Out
-0.5
Glasgow 27 Saints 20 -0.1
Games Above .500
Chance Will Make Playoffs