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*Chance in playoffs100.0*Average seed
Swarm 21 Bandits 7 -21.6
-0.7
Wings 15 Swarm 13 -9.1
-0.1
Rush 7 Mammoth 9 -6.2
-0.2
Rock 10 Knighthawks 9 +3.0
+0.1
Knighthawks 14 Wings 7 -0.3
Roughnecks 11 Stealth 12 -0.1
Week of 4/13100.0*Chance in playoffs100.0*Average seed
Stealth 10 Bandits 15 +17.0
+0.4
Rush 14 Knighthawks 10 +7.8
+0.3
Roughnecks 14 Knighthawks 15 -7.8
-0.1
Mammoth 12 Swarm 17 -0.5
Wings 10 Rock 9 +0.2
-0.1
Week of 4/20100.0*Chance in playoffs100.0*Average seed
Bandits 9 Knighthawks 10 Out
-0.9
Swarm 14 Mammoth 16 -0.3
Games Above .500
Chance Will Make Playoffs