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
Nonnie 41 Aunt Dar 100 In
+0.5
Aunt Sandy 88 Uncle Dave 59 +0.4
Graham 98 Uncle Rodney 111 +0.3
Isaac 75 Jake 86 -0.1
Kara 53 Poppa 95 -0.1
+0.2
Spencer 92 Uncle Scott 37 -0.1
Week of 11/30100.0*Chance in playoffs100.0*Average seed
Aunt Dar 100 Uncle Rodney 136 -0.5
Kara 106 Uncle Scott 93 -0.2
If winner is:HomeAway
Week of 12/7100.0*Chance in playoffs100.0*Average seed
Aunt Dar vs Jake+0.2-0.2
Kara vs Uncle Dave-0.2+0.2

What If

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

100100100100100100100100100100100100
If finish:Chance inChance will finish regular season at seed
TWW-Lplayoffs123456789101112Count
91-0In50509,641,805
80-1In88389,644,123
Total:In2967419,285,928
Games Above .500
Chance Will Make Playoffs