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 +14.9
+0.5
Larson 114.3 Illgen 130 -6.1
-0.1
Swords 149.9 Mendoza 88.5 +2.2
+0.1
Del Cueto 126.6 Brockett 94.7 +2.0
+0.1
Swikart 123.1 Cohen 80.8 +2.0
+0.1
Alter 102.6 Keating 100.9 +1.8
+0.1
If winner is:HomeAway
Week of 11/10100.0*Chance in playoffs100.0*Average seed
Petrella vs Del Cueto+14.4-14.4
+0.5-0.5
Keating vs Swikart-4.8+4.8
-0.1+0.1
Illgen vs Alter-4.6+4.6
-0.1+0.1
Mendoza vs Shroff-3.4+3.4
-0.2+0.2
Cohen vs Larson-0.6+0.6
Brockett vs Swords-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%881110482,898
83-198.446381521,927,664
72-279.89264520002,889,386
61-332.0032959901,926,244
50-42.83454210482,136
Total:69.0%20212826517,708,328
Games Above .500
Chance Will Make Playoffs