How are these numbers calculated?

Big Games

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

Week of 4/26100.0*Chance in playoffs100.0*Average seed
Independiente Medellin 2 America de Cali 0 -17.4
Week of 5/3None
Week of 5/10100.0*Chance in playoffs100.0*Average seed
Atletico-PR 0 Independiente Medellin 4 -49.8
America de Cali 0 Libertad 1 In
Chance Will Make Playoffs