How are these numbers calculated?

Big Games

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

Week of 11/9100.0*Chance in playoffs100.0*Average seed
Brandon 82.5 Sara 89.2 +1.0
+0.9
Mark 87.2 Ryan 78.7 +0.5
David 74.9 Josh 101.1 -0.2
Jake 119.2 Derek 108.6 +0.1
+0.1
Michael 88.3 Dan 109.9 +0.1
Jonathan 113.2 Andrew 131.5 -0.1
+0.1
If winner is:HomeAway
Week of 11/16100.0*Chance in playoffs100.0*Average seed
Sara vs Michael+3.4-3.4
+1.1-1.2
Ryan vs Jake-1.6+1.6
-0.1+0.1
Josh vs Mark-1.5+1.5
-0.1+0.1
Andrew vs Brandon+0.4-0.4
+0.2-0.2
Derek vs Jonathan-0.3+0.3
-0.1+0.1
Dan vs David-0.2+0.2
-0.1+0.1

What If

Chances based on how well the Sara finish out the regular season.   Explain

100100100100100100100100100100100100
If finish:Chance inChance will finish regular season at seed
TWW-Lplayoffs123456789101112Count
73-025.7%264525401,932,305
62-11.1192834216105,779,206
51-2Out0052035291015,785,498
40-3Out11646361,929,719
Total:3.6%4914151515139515,426,728
Games Above .500
Chance Will Make Playoffs