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
Roughnecks 11 Stealth 12 -0.7
Rush 7 Mammoth 9 +0.1
Rock 10 Knighthawks 9 +0.1
Knighthawks 14 Wings 7 -0.1
Week of 4/13100.0*Average seed
Roughnecks 14 Knighthawks 15 -0.4
Rush 14 Knighthawks 10 +0.3
Stealth 10 Bandits 15 +0.2
Week of 4/20100.0*Average seed
Rush 11 Roughnecks 12 +1.3
Bandits 9 Knighthawks 10 -0.3
Swarm 14 Mammoth 16 -0.1
Stealth 17 Wings 13 -0.1
Games Above .500
Chance Will Make Playoffs