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 +32.8
+1.0
Wales 23 Fiji 13 +1.3
+0.0
Australia 65 Uruguay 3 -0.5
-0.0
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
120-000In1002,833,757,760
Total:In1002,833,757,760
Points
Chance Will Make Playoffs