How are these numbers calculated?

Big Games

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

Week of 4/10100.0*Chance in playoffs100.0*Average seed
Hamilton-UNC 6 Witcraft 8 +38.1
+0.9
Hamilton-Md 2 Zwiefel 13 +11.9
+0.1
Games Above .500
Chance Will Make Playoffs