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
England 36 Italy 15 +13.4
+0.6
Scotland 29 Wales 13 +1.4
+0.0
Ireland 19 France 9 +0.3
+0.0
If winner is:HomeDrawAway
Week of 3/10100.0*Chance wins title100.0*Average seed
Wales vs Ireland+12.1+11.3-12.9
+0.1+0.2-0.1

What If

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

100100100100100100
If finish:ChanceChance will finish season at seed
TPW-OTLDwins title123456Count
18-20Yes1002,703,289,071*
161-01055.8%56444,744,534,013
0-002Yes10011,267,478
140-01125.3255025326,967,695
120-020No453432,376,330,803
Total:53.6%5423131010,162,389,060

* Row combines multiple less frequent records.

Points
Chance Will Win Championship