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 -20.2
-0.2
Impact 3 Rowdies 0 Out
-0.4
St. Louis 2 Aztex 1 -0.8
-0.1
Islanders 0 Timbers 1 +0.4
Rowdies 1 Stars 3 -0.4
Miami FC 4 St. Louis 2 +0.1
Week of 9/25100.0*Chance in playoffs100.0*Average seed
Miami FC 1 Rhinos 0 -0.3
Rowdies 6 Baltimore 3 +0.3
Aztex 4 St. Louis 2 +0.2
Baltimore 1 Timbers 3 +0.0
Week of 10/2100.0*Chance in playoffs100.0*Average seed
Miami FC 1 Islanders 1 -0.3
Points
Chance Will Make Playoffs