How are these numbers calculated?

Big Games

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

Week of 11/17100.0*Chance in playoffs100.0*Average seed
Erica 73.98 Shawn 61.7 +2.3
+0.2
Jenn 121.52 Dave 114.46 -2.2
-0.4
Laurel 104.68 Ethan 100.76 -0.2
-0.2
Tom H 81.9 Shara 100.3 +0.1
Eric 95.94 Tom K 95.72 -0.1
Justin 73 Riley 130.16 -0.1
Week of 11/24100.0*Chance in playoffs100.0*Average seed
Eric 74.36 Shawn 103.94 +33.1
+1.9
Dave 58.5 Riley 106.56 -0.7
-0.7
Erica 104.54 Tom H 64.7 -0.1
Justin 80.66 Laurel 101.48 -0.1
If winner is:HomeAway
Week of 12/1100.0*Chance in playoffs100.0*Average seed
Dave vs Shawn+46.7Out
+3.0-3.0
Eric vs Ethan-15.3+3.3
-1.3+0.3
Erica vs Shara-0.5+0.1

What If

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

100100100100100100100100100100100100
If finish:Chance inChance will finish regular season at seed
TWW-Lplayoffs123456789101112Count
51-093.3%93715,101,246
40-1Out6726715,098,970
Total:46.7%473713330,200,216
Games Above .500
Chance Will Make Playoffs