How are these numbers calculated?

Big Games

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

Week of 9/5100.0*Chance in playoffs100.0*Average seed
Austin 2 Seattle 1 +2.0
-0.1
Col Springs 3 Austin 0 +2.0
+0.1
Orange County 2 Los Angeles 1 -0.6
Arizona 2 Salt Lake City 3 +0.4
+0.2
Portland 0 Col Springs 1 +0.1
+0.2
Week of 9/12100.0*Chance in playoffs100.0*Average seed
Seattle 3 Austin 2 Out
-0.4
Salt Lake City 1 Arizona 0 +2.1
+0.1
Week of 9/19None
Points
Chance Will Make Playoffs