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 19 Hartland 11 +2.1
South Lyon East 11.5 Howell 18.5 +1.0
+0.0
Week of 2/4100.0*Chance wins title100.0*Average seed
Howell 28 South Lyon 2 +0.1
Hartland 10 South Lyon 20 +0.1
Week of 2/10100.0*Chance wins title100.0*Average seed
Pinckney 17 Brighton 13 Yes
Games Above .500
Chance Will Win Championship