How are these numbers calculated?

Big Games

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

Week of 9/25100.0*Chance in playoffs100.0*Average seed
England 25 Wales 28 +26.2
+0.7
Wales 23 Fiji 13 +11.6
+0.2
Australia 65 Uruguay 3 -1.8
-0.1
Week of 10/2100.0*Chance in playoffs100.0*Average seed
England 13 Australia 33 In
+0.0
Week of 10/9100.0*Chance in playoffs100.0*Average seed
Australia 15 Wales 6 -0.4

What If

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

100100100100100
If finish:Chance inChance will finish regular season at seed
TPW-OTLTplayoffs12345Count
120-000In100901,705,920
Total:In100901,705,920
Points
Chance Will Make Playoffs