How are these numbers calculated?

Big Games

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

Week of 10/20100.0*Chance in playoffs100.0*Average seed
Sunny 6 Porn 5 -16.4
-0.2
Greeks 3 Gotham 2 -8.2
-0.3
Week of 11/3100.0*Chance in playoffs100.0*Average seed
Sunny 2 Gotham 3 In
+0.8
Porn 1 Greeks 3 +0.1
Points
Chance Will Make Playoffs