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 +27.5
+0.6
Impact 3 Rowdies 0 +2.7
-0.1
St. Louis 2 Aztex 1 -0.7
Miami FC 4 St. Louis 2 In
Islanders 0 Timbers 1 +0.2
+0.1
Rowdies 1 Stars 3 +0.7
Whitecaps 0 Impact 1 -0.1
Week of 9/25100.0*Chance in playoffs100.0*Average seed
RailHawks 2 Islanders 1 +0.2
Week of 10/2None
Points
Chance Will Make Playoffs