How are these numbers calculated?

Big Games

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

Week of 11/3100.0*Chance in playoffs100.0*Average seed
Shroff 86.3 Petrella 87.6 +14.5
+0.5
Larson 114.3 Illgen 130 -6.0
-0.1
Swords 149.9 Mendoza 88.5 +2.3
+0.1
Swikart 123.1 Cohen 80.8 +1.9
+0.1
Alter 102.6 Keating 100.9 +1.9
+0.1
Del Cueto 126.6 Brockett 94.7 +1.8
+0.1
If winner is:HomeAway
Week of 11/10100.0*Chance in playoffs100.0*Average seed
Petrella vs Del Cueto+14.2-14.1
+0.5-0.5
Keating vs Swikart-4.8+4.8
-0.1+0.1
Illgen vs Alter-4.5+4.7
-0.1+0.1
Mendoza vs Shroff-3.4+3.4
-0.2+0.2
Brockett vs Swords-0.5+0.5
Cohen vs Larson-0.5+0.5

What If

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

100100100100100100
If finish:Chance inChance will finish regular season at seed
TWW-Lplayoffs123456Count
94-0100.0%8812101,494,665
83-198.346381525,787,167
72-279.68264520008,428,750
61-332.1032960805,444,166
50-42.83484091,327,044
Total:69.8%212128254122,481,792
Games Above .500
Chance Will Make Playoffs