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
Tim 105 David 86 +2.2
+0.5
Nathan 149 Jeff 97 +1.7
+0.1
Stephen 129 Mat 89 -0.1
-0.2
Week of 11/26100.0*Chance in playoffs100.0*Average seed
Tim 126 Mat 110 +23.0
+0.8
Nathan 194 Stephen 207 -4.6
-0.3
David 137 Jeff 168 -0.8
Games Above .500
Chance Will Make Playoffs