How are these numbers calculated?

Big Games

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

Week of 11/6100.0*Chance in playoffs100.0*Average seed
Witcraft 10 Schoolman 6 +18.2
+0.8
K. Jackson 5 Scheck 8 -0.7
-0.0
Zwiefel 9 M. Jackson 4 +0.1
Hartman 10 Kato 3 +0.1
Week of 11/20100.0*Chance in playoffs100.0*Average seed
Chick 7 Scheck 6 -52.4
-0.6
Witcraft 11 Kato 5 +20.8
+0.4
Zwiefel 7 Schoolman 11 +1.1
-0.1
Games Above .500
Chance Will Make Playoffs