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 +16.3
+0.3
South Lyon 5 Hartland 25 -8.2
-0.1
Pinckney 3 Hartland 27 -5.8
-0.1
Brighton 28 South Lyon East 2 -1.0
Milford 13 Brighton 17 -0.6
Week of 2/4100.0*Chance wins title100.0*Average seed
Hartland 21 South Lyon East 9 -8.7
-0.1
Howell 28 South Lyon 2 +8.7
+0.1
Hartland 22 South Lyon 8 -8.3
-0.1
South Lyon East 17 Brighton 13 +1.0
Week of 2/10100.0*Chance wins title100.0*Average seed
Hartland 13 Howell 17 Yes
+0.5
Brighton 13 Howell 17 +7.4
+0.1
Brighton 6 Hartland 24 -2.4
Milford 10.5 Howell 19.5 +2.3
Games Above .500
Chance Will Win Championship