How are these numbers calculated?

Big Games

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

Week of 4/8100.0*Chance in playoffs100.0*Average seed
Racing 4 Nacional 1 In
Oriente Petrolero 2 Universitario 2 +3.6
Week of 4/15100.0*Chance in playoffs100.0*Average seed
Oriente Petrolero 0 Racing 1 +0.2
Universitario 2 Nacional 2 +0.2
Week of 4/25None
Chance Will Make Playoffs