How are these numbers calculated?

Big Games

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

Week of 11/19100.0*Chance in playoffs100.0*Average seed
Nathan 92 Stephen 107 -1.2
Chelsea 62 Jordan 99 +0.5
+0.0
Dan 60 Justin 60 +0.3
+0.0
Matt 73 Keith 57 +0.1
+0.2
Week of 11/26100.0*Chance in playoffs100.0*Average seed
Stephen 124 Tom 89 -0.2
-0.1
Nathan 73 Dan 80 In
+0.4
Tom O 123 Chelsea 74 In
+0.1
Keith 60 Jordan 63 +0.1
+0.1
Week of 12/3None
Games Above .500
Chance Will Make Playoffs