How are these numbers calculated?

Big Games

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

Week of 4/15100.0*Chance in playoffs100.0*Average seed
Mill Creek High 2 Peachtree Ridge 0 -12.1
-0.5
Mountain View H 0 Habersham Centr 4 -1.3
-0.1
Duluth High Sch 2 Meadowcreek Hig 0 +1.2
+0.0
Week of 4/18100.0*Chance in playoffs100.0*Average seed
Collins Hill Hi 0 Peachtree Ridge 3 In
+1.8
Peachtree Ridge 2 Norcross High S 1 +20.6
+1.2
Habersham Centr 1 Duluth High Sch 2 +4.2
+0.1
Norcross High S 2 Duluth High Sch 5 -0.3
Points
Chance Will Make Playoffs