How are these numbers calculated?

Big Games

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

Week of 9/18100.0*Chance in playoffs100.0*Average seed
Stars 1 Whitecaps 0 +15.9
+0.5
St. Louis 2 Aztex 1 -2.3
Impact 3 Rowdies 0 +2.3
-0.2
Miami FC 4 St. Louis 2 In
Rowdies 1 Stars 3 +0.5
Whitecaps 0 Impact 1 -0.2
Islanders 0 Timbers 1 +0.1
Week of 9/25100.0*Chance in playoffs100.0*Average seed
RailHawks 2 Islanders 1 +0.3
Week of 10/2None
Points
Chance Will Make Playoffs