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*Average seed
Milford 5 Brighton 25 -0.2
Milford 2 Pinckney 28 -0.2
Pinckney 19 Hartland 11 -0.1
South Lyon 12.5 Hartland 17.5 +0.0
Week of 2/4100.0*Average seed
Pinckney 24 Milford 6 -0.1
Week of 2/10100.0*Average seed
South Lyon 23 Milford 7 -0.1
South Lyon East 2 Pinckney 28 +0.1
Games Above .500
Chance Will Win Championship