How are these numbers calculated?

Big Games

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

Week of 4/6100.0*Chance in playoffs100.0*Average seed
Universidad Catolica 0 Velez Sarsfield 0 -17.5
Union Espanola 1 Caracas 2 +1.3
Week of 4/13100.0*Chance in playoffs100.0*Average seed
Caracas 0 Velez Sarsfield 3 In
Universidad Catolica 2 Union Espanola 1 -0.2
Week of 4/20None
Chance Will Make Playoffs