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
Revolution 3 Tampa Bay Mutin 0 -22.2
-1.0
Tampa Bay Mutin 2 Red Bulls 1 +17.9
+0.8
DC United 1 Miami Fusion 3 -13.1
-0.3
Miami Fusion 4 DC United 3 -8.1
-0.2
Red Bulls 0 DC United 5 +0.2
FC Dallas 1 Earthquakes 3 -0.1
Earthquakes 0 Galaxy 0 +0.0
Week of 9/20100.0*Chance in playoffs100.0*Average seed
Crew 3 Tampa Bay Mutin 4 +23.0
+1.3
Fire 3 Revolution 2 +6.0
+0.3
Galaxy 0 Earthquakes 1 -0.2
Revolution 0 Red Bulls 0 +0.2
Rapids 3 FC Dallas 1 +0.1
Week of 9/27100.0*Chance in playoffs100.0*Average seed
Miami Fusion 1 Tampa Bay Mutin 3 In
+2.1
Earthquakes 2 Wizards 0 -0.2
Points
Chance Will Make Playoffs