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
Impact 3 Rowdies 0 +2.2
-0.1
Miami FC 4 St. Louis 2 In
Islanders 0 Timbers 1 -0.6
-0.5
Stars 1 Whitecaps 0 -0.6
-0.1
St. Louis 2 Aztex 1 -0.1
Rowdies 1 Stars 3 -0.4
Whitecaps 0 Impact 1 -0.2
Baltimore 2 RailHawks 4 -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