How are these numbers calculated?

Big Games

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

Week of 5/16100.0*Chance in playoffs100.0*Average seed
Botafogo 1 Atletico Nacional 0 In
Barcelona 0 Estudiantes 3 -7.8
Week of 5/24100.0*Chance in playoffs100.0*Average seed
Atletico Nacional 3 Barcelona 1 +0.3
Estudiantes 1 Botafogo 0 -0.3
Chance Will Make Playoffs