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
Mammoth 13 Knighthawks 7 In
+0.4
Rush 12 Black Wolves 13 -1.5
Swarm 17 Bandits 16 +0.4
Stealth 15 Roughnecks 11 -0.1
Rock 8 Bandits 13 +0.2
Week of 4/22100.0*Chance in playoffs100.0*Average seed
Stealth 13 Mammoth 7 -0.4
Knighthawks 15 Black Wolves 13 +0.1
Week of 4/28100.0*Chance in playoffs100.0*Average seed
Black Wolves 16 Stealth 17 -0.5
Mammoth 9 Rush 10 -0.2
Games Above .500
Chance Will Make Playoffs