How are these numbers calculated?

Big Games

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

Week of 4/8None
Week of 4/15100.0*Chance in playoffs100.0*Average seed
Universidad Catolica 2 America 0 -45.5
River Plate 5 Universidad San Martin 0 *+0.1
Week of 4/22None

* A starred number could be exactly 0 or just really small. The simulation did not run long enough to know.

Chance Will Make Playoffs