How are these numbers calculated?

Big Games

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

Week of 2/18100.0*Chance wins title100.0*Average seed
Chile 10 Argentina XV 45 +16.4
+0.4
Canada 34 United States 51 -5.5
-0.0
Uruguay 23 Brazil 12 +1.2
Week of 2/25100.0*Chance wins title100.0*Average seed
Argentina XV 79 Brazil 7 +13.3
+0.2
Chile 9 United States 57 -13.0
-0.1
If winner is:HomeDrawAway
Week of 3/3100.0*Chance wins title100.0*Average seed
Argentina XV vs United StatesYesYesNo
+0.5+0.5-0.5

What If

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

100100100100100100
If finish:ChanceChance will finish season at seed
TPW-OTLDwins title123456Count
18-20Yes1008,187,689,850*
160-010No1007,444,471,994
Total:52.4%524815,632,161,844

* Row combines multiple less frequent records.

Points
Chance Will Win Championship