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*Average seed
Baltimore 2 RailHawks 4 +0.5
Whitecaps 0 Impact 1 +0.4
Stars 1 Whitecaps 0 +0.1
Islanders 0 Timbers 1 +0.0
Week of 9/25100.0*Average seed
RailHawks 2 Islanders 1 +1.0
RailHawks 3 Aztex 1 +0.9
Week of 10/2100.0*Average seed
Whitecaps 2 Timbers 2 +0.6
Points
Chance Will Make Playoffs