How are these numbers calculated?

Big Games

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

Week of 8/26100.0*Chance in playoffs100.0*Average seed
DC United 2 Miami 1 -12.6
-0.5
Rapids 3 Miami 1 -11.5
-0.5
Crew 3 Tampa Bay 4 +4.9
+0.1
Revolution 2 Crew 1 -4.8
-0.3
Revolution 1 DC United 0 -2.4
-0.1
Dallas 4 New York 6 +2.3
Earthquakes 3 Crew 0 +1.9
+0.1
Fire 4 Dallas 0 +1.8
Rapids 1 Wizards 1 +0.2
Week of 9/2100.0*Chance in playoffs100.0*Average seed
New York 2 Miami 1 -13.9
-0.4
Rapids 1 Galaxy 0 Out
-0.2
Miami 4 New York 1 +11.4
+0.4
Fire 2 Rapids 1 +4.0
+0.1
Galaxy 0 Dallas 1 -1.5
Fire 3 Crew 1 +1.4
+0.1
DC United 2 Revolution 0 +0.3
Week of 9/9100.0*Chance in playoffs100.0*Average seed
DC United 2 Miami 6 +0.4
Crew 2 Fire 3 +0.3
Points
Chance Will Make Playoffs