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 -9.3
-1.0
Mark 87.2 Ryan 78.7 +3.1
+0.1
Michael 88.3 Dan 109.9 +1.2
David 74.9 Josh 101.1 -1.2
Jonathan 113.2 Andrew 131.5 -1.0
Jake 119.2 Derek 108.6 +0.2
+0.1
If winner is:HomeAway
Week of 11/16100.0*Chance in playoffs100.0*Average seed
Andrew vs Brandon-4.7+4.7
-1.0+1.0
Josh vs Mark-2.3+2.3
-0.1+0.1
Ryan vs Jake-1.5+1.5
-0.1+0.1
Dan vs David-0.4+0.4
-0.1+0.1
Derek vs Jonathan-0.1+0.1

What If

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

100100100100100100100100100100100100
If finish:Chance inChance will finish regular season at seed
TWW-Lplayoffs123456789101112Count
73-037.6%384416201,928,558
62-11.82112733216005,782,701
51-2Out015213629815,782,777
40-3Out032646251,932,692
Total:5.4%51012151516149315,426,728
Games Above .500
Chance Will Make Playoffs