How are these numbers calculated?

Big Games

How we did yesterday and who we should root for today.   Explain

Friday, 3/4100.0*Average seed
Harvard 69 Princeton 67 +0.5
Columbia 66 Brown 63 +0.0
If winner is:HomeAway
Saturday, 3/5100.0*Average seed
Harvard vs Penn+0.4-0.6
Dartmouth vs Princeton-0.1+0.0

What If

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

100100100100100100100100
If finish:ChanceChance will finish season at seed
TWW-Lwins title12345678Count
61-0No9645,019,888,107
50-1No9193,181,956,757
Total:No593848,201,844,864
Games Above .500
Chance Will Win Championship