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 -13.3
-0.4
Rush 11 Bandits 8 -1.4
-0.2
Knighthawks 14 Roughnecks 12 -1.0
Week of 4/20100.0*Chance in playoffs100.0*Average seed
Stealth 13 Rock 16 -8.5
-0.1
Mammoth 11 Rush 14 -0.9
Week of 4/28None
Games Above .500
Chance Will Make Playoffs