How are these numbers calculated?

Big Games

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

Week of 2/25100.0*Chance wins title100.0*Average seed
Ireland 19 France 9 -0.0
+0.0
Scotland 29 Wales 13 -0.0
England 36 Italy 15 No
-0.5
If winner is:HomeDrawAway
Week of 3/10100.0*Chance wins title100.0*Average seed
Wales vs Ireland-0.1+0.0+0.1

What If

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

100100100100100100
If finish:ChanceChance will finish season at seed
TPW-OTLDwins title123456Count
82-000No275232,376,351,698
61-001No4852326,920,507
0-4No1007,459,116,855*
Total:No0198110,162,389,060

* Row combines multiple less frequent records.

Points
Chance Will Win Championship