How are these numbers calculated?

Big Games

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

Week of 4/4100.0*Chance in playoffs100.0*Average seed
Winder Barrow H 2 Apalachee High 3 -38.5
-0.8
Winder Barrow H 0 Clarke Central 4 -21.3
-0.3
Week of 4/12None
Week of 4/18100.0*Chance in playoffs100.0*Average seed
Flowery Branch 1 Cedar Shoals Hi 0 -1.1
-0.1
Heritage High S 5 Loganville High 2 Out
-0.0
Apalachee High 5 Flowery Branch 3 +0.2
+0.2
Points
Chance Will Make Playoffs