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
South Lyon 5 Brighton 25 -3.6
-0.1
Howell 22 Pinckney 8 -0.4
Week of 2/9100.0*Chance wins title100.0*Average seed
South Lyon East 9 Howell 21 No
South Lyon 23 Milford 7 +0.0
Brighton 18 Pinckney 12 -0.0
South Lyon 27 Pinckney 3 +0.0
Week of 2/16None
Games Above .500
Chance Will Win Championship