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 -1.4
-0.1
Week of 2/12100.0*Chance in playoffs100.0*Average seed
South End 2 0 South End 3 2 Out
-0.4
West End 3 2 South End 4 2 -0.5
Ottawa Centre 2 2 South End 1 7 -0.1
Games Above .500
Chance Will Make Playoffs