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 -3.0
Chelsea 62 Jordan 99 -1.9
-0.3
Matt 73 Keith 57 +0.3
+0.4
Dan 60 Justin 60 +0.0
Week of 11/26100.0*Chance in playoffs100.0*Average seed
Tom O 123 Chelsea 74 -10.5
-0.6
Stephen 124 Tom 89 -4.3
-0.1
Keith 60 Jordan 63 +0.6
+0.1
Nathan 73 Dan 80 -0.0
Week of 12/3100.0*Chance in playoffs100.0*Average seed
Stephen 81 Chelsea 76 Out
-0.8
Games Above .500
Chance Will Make Playoffs