How are these numbers calculated?

Big Games

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

Week of 1/27100.0*Chance wins title100.0*Average seed
South Lyon East 1 Howell 29 +8.9
+0.1
South Lyon 5 Hartland 25 -3.0
-0.0
Pinckney 3 Hartland 27 -2.8
-0.0
Brighton 28 South Lyon East 2 -0.1
Week of 2/4100.0*Chance wins title100.0*Average seed
Hartland 21 South Lyon East 9 -5.0
-0.1
Hartland 22 South Lyon 8 -2.5
-0.0
Howell 28 South Lyon 2 +1.7
+0.0
South Lyon East 17 Brighton 13 +0.1
Week of 2/10100.0*Chance wins title100.0*Average seed
Hartland 13 Howell 17 Yes
+0.5
Brighton 6 Hartland 24 -3.6
-0.0
Brighton 13 Howell 17 +0.9
Milford 10.5 Howell 19.5 +0.1
Games Above .500
Chance Will Win Championship