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*Average seed
Knighthawks 14 Roughnecks 12 +0.2
Mammoth 19 Rock 12 +0.2
Week of 4/20100.0*Average seed
Mammoth 11 Rush 14 -0.6
Week of 4/28None
Games Above .500
Chance Will Make Playoffs