How are these numbers calculated?

Big Games

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

Week of 10/12100.0*Chance in playoffs100.0*Average seed
Seattle 0 Dynamo 0 +0.3
-0.1
Rapids 2 Earthquakes 1 +0.3
Week of 10/16100.0*Chance in playoffs100.0*Average seed
Portland 1 Rapids 0 -3.4
-0.1
FC Dallas 2 Seattle 1 -1.6
-0.5
Real Salt Lake 0 Sporting KC 0 +0.4
+0.1
Dynamo 0 Galaxy 1 -0.1
Week of 10/23100.0*Chance in playoffs100.0*Average seed
Sporting KC 2 Earthquakes 0 -14.7
-0.4
Seattle 2 Real Salt Lake 1 In
+1.1
Vancouver 4 Portland 1 In
+0.2
Points
Chance Will Make Playoffs