How are these numbers calculated?

Big Games

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

Week of 4/4100.0*Chance in playoffs100.0*Average seed
North Oconee Hi 6 Elbert County H 0 In
-0.1
Week of 4/11None
Week of 4/21100.0*Chance in playoffs100.0*Average seed
Oconee County H 2 Jackson County 3 -0.7
East Jackson Co 0 Jackson County 2 -0.6
North Oconee Hi 0 Oconee County H 1 +0.5
Points
Chance Will Make Playoffs