How are these numbers calculated?

Big Games

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

Week of 11/23100.0*Chance in playoffs100.0*Average seed
Isaac 75 Jake 86 +15.7
+0.7
Aunt Sandy 88 Uncle Dave 59 +7.2
+0.4
Nonnie 41 Aunt Dar 100 +0.6
Graham 98 Uncle Rodney 111 -0.2
Spencer 92 Uncle Scott 37 +0.0
Kara 53 Poppa 95 -0.1
Week of 11/30100.0*Chance in playoffs100.0*Average seed
Nonnie 86 Jake 93 +37.3
+0.8
Spencer 106 Uncle Dave 129 -15.1
-0.3
Isaac 48 Poppa 106 -0.6
Graham 138 Aunt Sandy 113 +0.5
-0.0
Kara 106 Uncle Scott 93 -0.4
If winner is:HomeAway
Week of 12/7100.0*Chance in playoffs100.0*Average seed
Kara vs Uncle DaveIn-47.1
+0.2-0.4
Aunt Dar vs Jake-9.6+17.4
-0.1+0.2
Graham vs Spencer+3.0-1.2

What If

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

100100100100100100100100100100100100
If finish:Chance inChance will finish regular season at seed
TWW-Lplayoffs123456789101112Count
71-091.5%983924,206,623
60-164.5643643,942,377
Total:74.1%3712668,149,000
Games Above .500
Chance Will Make Playoffs