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
Arizona 2 Salt Lake City 3 +2.6
Portland 0 Col Springs 1 +1.2
-2.6
-0.1
Austin 2 Seattle 1 +0.4
+1.2
+0.2
Orange County 2 Los Angeles 1 -0.1
+0.5
Col Springs 3 Austin 0 -3.2
-0.1
Week of 9/12100.0*Chance in playoffs100.0*First-round bye100.0*Average seed
Portland 0 Sacramento 3 +14.5
+0.7
Vancouver 1 Orange County 1 +6.2
+0.1
Los Angeles 0 Portland 1 +3.8
+0.1
OKC 3 Col Springs 3 +1.6
+0.1
Arizona 0 OKC 1 -1.0
-0.2
Week of 9/19100.0*Chance in playoffs100.0*First-round bye100.0*Average seed
Orange County 0 Sacramento 0 No
-0.8
Col Springs 0 Los Angeles 1 +22.6
+0.4
Sacramento 0 Arizona 0 -19.4
-0.7
Points
Chance Will Make Playoffs