How are these numbers calculated?

Big Games

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

Week of 3/25100.0*Chance in playoffs100.0*Average seed
Lanus 2 Cerro Porteno 0 -25.5
Deportivo Cali 1 O'Higgins 1 +0.1
Week of 4/1None
Week of 4/8100.0*Chance in playoffs100.0*Average seed
Cerro Porteno 3 Deportivo Cali 2 In
O'Higgins 0 Lanus 0 -0.1
Chance Will Make Playoffs