How are these numbers calculated?

Big Games

How we did last week and who we should root for this week.   Explain

Week of 4/19100.0*Chance in playoffs100.0*Average seed
Glasgow 35 Ospreys 17 -23.1
-0.5
Scarlets 24 Blues 6 -7.3
-0.1
Zebre 22 Leinster 41 -0.8
-0.0
Connacht 18 Ulster 34 -0.4
-0.0
Week of 4/26None
Week of 5/3100.0*Chance in playoffs100.0*Average seed
Scarlets 17 Treviso 41 +18.9
+0.2
Leinster 37 Ospreys 19 Out
-0.1
Connacht 3 Glasgow 20 -2.7
-0.0
Games Above .500
Chance Will Make Playoffs