How are these numbers calculated?

Big Games

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

Week of 4/12100.0*Chance in playoffs100.0*Average seed
Rock 10 Wings 9 -15.9
-0.5
Knighthawks 10 Stealth 7 +2.0
+0.1
Swarm 10 Bandits 9 -0.5
-0.1
Week of 4/19100.0*Chance in playoffs100.0*Average seed
Stealth 11 Wings 15 +17.0
+0.5
Swarm 12 Mammoth 18 -12.0
-0.1
Week of 4/26100.0*Chance in playoffs100.0*Average seed
Wings 12 Mammoth 13 Out
-0.6
Games Above .500
Chance Will Make Playoffs