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
Knighthawks 14 Roughnecks 12 +4.6
+0.5
Swarm 14 Stealth 9 +3.7
Rush 11 Bandits 8 -1.6
+0.1
Week of 4/20100.0*Chance in playoffs100.0*Average seed
Stealth 13 Rock 16 -0.1
Week of 4/28100.0*Chance in playoffs100.0*Average seed
Knighthawks 9 Wings 7 +2.0
Games Above .500
Chance Will Make Playoffs