How are these numbers calculated?

Big Games

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

Week of 4/6100.0*Average seed
Rock 10 Knighthawks 9 +0.4
Rush 7 Mammoth 9 +0.2
Roughnecks 11 Stealth 12 +0.1
Week of 4/13100.0*Average seed
Rush 14 Knighthawks 10 -0.3
Wings 10 Rock 9 -0.2
Stealth 10 Bandits 15 +0.1
Week of 4/20100.0*Average seed
Rush 11 Roughnecks 12 +0.5
Games Above .500
Chance Will Make Playoffs