How are these numbers calculated?

Big Games

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

Week of 2/5100.0*Chance wins title100.0*Average seed
Howell 22 Pinckney 8 -0.0
South Lyon 5 Brighton 25 -0.2
Milford 3 Hartland 27 +0.1
Week of 2/9100.0*Chance wins title100.0*Average seed
South Lyon East 9 Howell 21 No
Brighton 18 Pinckney 12 -0.2
South Lyon 23 Milford 7 -0.0
South Lyon East 3 Hartland 27 +0.1
Week of 2/16100.0*Chance wins title100.0*Average seed
Hartland 14.5 Howell 15.5 -0.2
Brighton 27 Milford 3 -0.1
Games Above .500
Chance Will Win Championship