How are these numbers calculated?

Big Games

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

Week of 10/11100.0*Chance in playoffs100.0*Average seed
Portland 0 Real Salt Lake 0 +8.6
+0.1
FC Dallas 2 Galaxy 1 -1.3
-0.1
Week of 10/18100.0*Chance in playoffs100.0*Average seed
Earthquakes 0 Vancouver 0 +6.5
+0.1
Week of 10/25100.0*Chance in playoffs100.0*Average seed
FC Dallas 0 Portland 2 -31.3
-0.3
Vancouver 1 Rapids 0 In
+0.1
Points
Chance Will Make Playoffs