How are these numbers calculated?

Big Games

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

Week of 2/9100.0*Chance in playoffs100.0*Average seed
South End 4 4 South End 2 0 -1.3
-0.0
Week of 2/12100.0*Chance in playoffs100.0*Average seed
South End 2 0 South End 3 2 In
+0.5
West End 3 2 South End 4 2 -0.4
-0.0
Ottawa Centre 2 2 South End 1 7 -0.3
+0.3
Games Above .500
Chance Will Make Playoffs