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
Mountain View H 0 Habersham Centr 4 +23.1
+1.0
Mill Creek High 2 Peachtree Ridge 0 +4.2
+0.2
Duluth High Sch 2 Meadowcreek Hig 0 +2.3
+0.1
North Gwinnett 0 Mill Creek High 1 -0.1
+0.0
Week of 4/18100.0*Chance in playoffs100.0*Average seed
Habersham Centr 1 Duluth High Sch 2 -51.3
-1.3
Collins Hill Hi 0 Peachtree Ridge 3 -6.1
-0.2
Peachtree Ridge 2 Norcross High S 1 +3.5
-0.1
Norcross High S 2 Duluth High Sch 5 +0.4
Points
Chance Will Make Playoffs