How are these numbers calculated?

Big Games

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

Week of 4/14100.0*Chance in playoffs100.0*Average seed
Swarm 14 Stealth 9 In
+0.4
Knighthawks 14 Roughnecks 12 -0.2
Rush 11 Bandits 8 -0.1
-0.0
Week of 4/20100.0*Chance in playoffs100.0*Average seed
Mammoth 11 Rush 14 -0.2
Week of 4/28None
Games Above .500
Chance Will Make Playoffs