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
Pinckney 3 Hartland 27 No
-0.1
Milford 9 Pinckney 21 +0.1
Brighton 28 South Lyon East 2 -0.1
South Lyon 5 Hartland 25 +0.0
Milford 13 Brighton 17 -0.0
Week of 2/4100.0*Chance wins title100.0*Average seed
Pinckney 27 Milford 3 +0.1
Hartland 21 South Lyon East 9 +0.0
Hartland 22 South Lyon 8 +0.0
Howell 28 South Lyon 2 +0.0
Week of 2/10100.0*Chance wins title100.0*Average seed
Pinckney 24 Brighton 6 +0.7
South Lyon 20 Brighton 10 -0.5
South Lyon East 27 Pinckney 3 -0.5
Pinckney 14 South Lyon 16 -0.3
Brighton 6 Hartland 24 +0.0
Brighton 13 Howell 17 +0.0
Games Above .500
Chance Will Win Championship