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
Jenn 121.52 Dave 114.46 -4.5
-0.6
Erica 73.98 Shawn 61.7 +1.5
+0.1
Eric 95.94 Tom K 95.72 -0.5
Laurel 104.68 Ethan 100.76 -0.4
-0.1
Tom H 81.9 Shara 100.3 +0.2
Justin 73 Riley 130.16 -0.1
-0.1
Week of 11/24100.0*Chance in playoffs100.0*Average seed
Eric 74.36 Shawn 103.94 +22.9
+1.3
Dave 58.5 Riley 106.56 -2.1
-0.8
Erica 104.54 Tom H 64.7 -0.1
If winner is:HomeAway
Week of 12/1100.0*Chance in playoffs100.0*Average seed
Dave vs Shawn+41.6Out
+3.0-3.0
Eric vs Ethan-8.4+8.4
-0.7+0.7
Erica vs Shara-0.3+0.3

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
51-083.3%83175,141,629
40-1Out2542335,139,515
Total:41.6%4221211610,281,144
Games Above .500
Chance Will Make Playoffs