How are these numbers calculated?

Big Games

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

Week of 9/13100.0*Chance in playoffs100.0*Average seed
Red Bulls 0 FC Dallas 1 -0.1
Tampa Bay Mutin 1 DC United 2 -0.3
DC United 2 Revolution 2 *+0.0
Tampa Bay Mutin 2 Crew 1 +0.6
Crew 4 Wizards 0 -0.1
FC Dallas 1 Galaxy 3 +0.1
Galaxy 2 FC Dallas 1 +0.1
Week of 9/20100.0*Chance in playoffs100.0*Average seed
DC United 1 Tampa Bay Mutin 2 +0.5
Tampa Bay Mutin 1 DC United 5 -0.3
Earthquakes 2 Galaxy 3 -0.1
FC Dallas 1 Revolution 2 +0.1
Week of 9/28100.0*Chance in playoffs100.0*Average seed
Galaxy 2 Wizards 0 -0.3
Crew 1 Tampa Bay Mutin 1 +0.1

* A starred number could be exactly 0 or just really small. The simulation did not run long enough to know.

Points
Chance Will Make Playoffs