How are these numbers calculated?

Big Games

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

Week of 9/25100.0*Chance in playoffs100.0*Average seed
Crew 2 Miami 1 -18.9
-0.5
Wizards 0 Rapids 0 +0.0
Week of 10/2100.0*Chance in playoffs100.0*Average seed
Revolution 2 New York 1 -17.5
-0.4
Miami 4 Crew 1 +13.3
+0.5
Earthquakes 1 Wizards 0 +0.1
Week of 10/9100.0*Chance in playoffs100.0*Average seed
Miami 2 Rapids 0 +36.6
+0.7
DC United 1 Revolution 1 +2.8
+0.1
Points
Chance Will Make Playoffs