How are these numbers calculated?

Big Games

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

Week of 1/28100.0*Chance wins title100.0*Average seed
Hartland 4 Brighton 26 +4.8
Howell 26 Brighton 4 +3.2
+0.0
Hartland 15.5 South Lyon East 15 -1.1
Howell 29 South Lyon East 1 +0.9
+0.0
Week of 2/5100.0*Chance wins title100.0*Average seed
Hartland 15 South Lyon 16 +0.7
Milford 0 Howell 30 +0.1
Brighton 4.5 Howell 25.5 Yes
Week of 2/10None
Games Above .500
Chance Will Win Championship