How are these numbers calculated?

Big Games

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

Week of 10/4100.0*Chance in playoffs100.0*Average seed
Red Bulls 2 Galaxy 0 -5.5
-0.2
Sounders 0 Union 2 -0.9
Week of 10/12100.0*Chance in playoffs100.0*Average seed
Timbers 0 Dynamo 2 -22.0
-0.7
Whitecaps 2 DC United 1 +2.6
+0.1
New England 0 Crew 3 -1.4
Sporting KC 2 Red Bulls 0 +1.0
DC United 1 Fire 2 +0.9
-0.1
Fire 1 FC Dallas 2 -0.5
+0.1
Galaxy 1 Chivas USA 0 +0.1
Sounders 2 Earthquakes 1 +0.0
Week of 10/19100.0*Chance in playoffs100.0*Average seed
Red Bulls 1 Union 0 Out
-0.0
DC United 1 Timbers 1 -1.8
+0.2
Fire 3 Crew 2 -0.5
DC United 0 Sporting KC 1 +0.3
Real Salt Lake 1 Timbers 1 -0.1
Points
Chance Will Make Playoffs