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
Matt 73 Keith 57 -0.6
-0.6
Nathan 92 Stephen 107 -0.1
Chelsea 62 Jordan 99 +0.1
Dan 60 Justin 60 +0.2
Week of 11/26100.0*Chance in playoffs100.0*Average seed
Tom O 123 Chelsea 74 +2.9
+0.4
Stephen 124 Tom 89 -1.0
Keith 60 Jordan 63 -0.9
-0.2
Nathan 73 Dan 80 -0.0
Week of 12/3100.0*Chance in playoffs100.0*Average seed
Keith 76 Tom O 75 In
+0.3
Stephen 81 Chelsea 76 In
-0.1
Games Above .500
Chance Will Make Playoffs