How are these numbers calculated?

Big Games

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

Week of 4/2100.0*Chance in playoffs100.0*Average seed
Boca Juniors 1 Barcelona 0 +23.9
Nacional 4 Toluca 0 In
Week of 4/9None
Week of 4/16100.0*Chance in playoffs100.0*Average seed
Barcelona 1 Nacional 0 +0.4
Toluca 3 Boca Juniors 2 -0.2
Chance Will Make Playoffs