How are these numbers calculated?

Big Games

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

Week of 1/28100.0*Average seed
Milford 2 Pinckney 28 +0.2
South Lyon 22.5 Pinckney 7.5 -0.1
Hartland 15.5 South Lyon East 15 +0.0
Howell 29 South Lyon East 1 +0.0
Week of 2/5100.0*Average seed
South Lyon East 23 Pinckney 7 -0.4
Pinckney 2 Hartland 28 -0.0
South Lyon East 17 Milford 13 -0.0
Week of 2/10None
Games Above .500
Chance Will Win Championship