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*First-round bye100.0*Average seed
Orange County 2 Los Angeles 1 +1.5
+17.8
+0.8
Arizona 2 Salt Lake City 3 +0.8
Portland 0 Col Springs 1 +0.1
-3.8
-0.2
Austin 2 Seattle 1 +2.4
+0.1
Col Springs 3 Austin 0 -3.3
-0.1
Week of 9/12100.0*Chance in playoffs100.0*First-round bye100.0*Average seed
Vancouver 1 Orange County 1 -8.8
-0.2
Portland 0 Sacramento 3 -6.0
-0.1
OKC 3 Col Springs 3 +3.7
+0.1
Los Angeles 0 Portland 1 +1.9
+0.1
Arizona 0 OKC 1 +1.9
-0.1
Week of 9/19100.0*Chance in playoffs100.0*First-round bye100.0*Average seed
Orange County 0 Sacramento 0 Yes
+0.8
Col Springs 0 Los Angeles 1 +7.1
+0.4
Sacramento 0 Arizona 0 +7.1
+0.1
Points
Chance Will Make Playoffs