How are these numbers calculated?

Big Games

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

Week of 11/4100.0*Chance wins title100.0*Top Half100.0*Last Place100.0*Average seed
Penn 38 Princeton 35 +0.1
+15.6
-2.4
+0.8
Columbia 14 Harvard 21 -0.2
-0.1
Brown 10 Dartmouth 33 -0.0
-0.9
No
-0.0
Dartmouth 10 Cornell 0 -0.2
+0.1
Week of 11/11100.0*Chance wins title100.0*Top Half100.0*Last Place100.0*Average seed
Harvard 6 Penn 23 +0.2
+23.1
+0.9
Cornell 8 Columbia 18 -0.1
+2.5
+0.1
Princeton 31 Yale 35 No
+4.8
+0.2
If winner is:HomeAway
Week of 11/18100.0*Chance wins title100.0*Top Half100.0*Last Place100.0*Average seed
Penn vs Cornell+31.6No
+0.7-1.4
Yale vs Harvard+5.2-21.2
+0.1-0.4
Dartmouth vs Princeton-1.0+1.0
-0.1+0.1
Columbia vs Brown-0.2+1.4
-0.0+0.3

What If

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

100100100100100100100100
If finish:ChanceTopChance will finish season at seedLast
TPW-Lwins titleHalf12345678PlaceCount
81-0No92.1%226658No3,677,909,436
60-1NoNo334819No1,915,236,996
Total:No60.6%1174217166No5,593,146,432
Games Above .500
Chance Will Win Championship