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 0 Clarke Central 4 +5.7
+0.1
Winder Barrow H 2 Apalachee High 3 +1.6
-0.1
Week of 4/12100.0*Chance in playoffs100.0*Average seed
Clarke Central 8 Salem High Scho 1 +0.2
Week of 4/18100.0*Chance in playoffs100.0*Average seed
Apalachee High 5 Flowery Branch 3 Out
-1.1
Flowery Branch 1 Cedar Shoals Hi 0 +23.3
+0.8
Heritage High S 5 Loganville High 2 -0.7
Points
Chance Will Make Playoffs