How are these numbers calculated?

Big Games

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

Week of 11/20100.0*Chance in playoffs100.0*Average seed
Ruth 90 Michael 103 -11.4
-0.8
Craig 118 Josh 69 +2.6
Paul 82 Jeremy 68 +2.5
-0.0
Scott 130 Jordan 105 +0.6
Week of 11/27100.0*Chance in playoffs100.0*Average seed
Jeremy 102 Josh 123 +0.4
Ruth 87 Scott 60 +0.4
Games Above .500
Chance Will Make Playoffs