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
Howell 26 Brighton 4 -0.1
+0.0
Hartland 4 Brighton 26 -0.1
South Lyon 22.5 Pinckney 7.5 +0.1
Howell 29 South Lyon East 1 +0.0
Week of 2/5100.0*Chance wins title100.0*Average seed
Hartland 15 South Lyon 16 +0.4
Brighton 4.5 Howell 25.5 No
+0.0
Pinckney 2 Hartland 28 -0.1
Brighton 22 South Lyon 8 -0.7
South Lyon East 4 Hartland 26 -0.1
Week of 2/10100.0*Chance wins title100.0*Average seed
South Lyon 15 Howell 16 -0.1
South Lyon 27 South Lyon East 3 +0.0
Milford 5 Brighton 25 -0.0
Hartland 8 Howell 22 +0.0
Hartland 19 Milford 11 -0.0
Games Above .500
Chance Will Win Championship