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
South Africa 46 Samoa 6 +2.5
-0.2
Scotland 39 United States 16 -1.8
-0.0
Week of 10/2100.0*Chance in playoffs100.0*Average seed
Samoa 5 Japan 26 +33.1
+0.8
South Africa 34 Scotland 16 -21.1
-0.2
South Africa 64 United States 0 -4.9
-0.1
Week of 10/9100.0*Chance in playoffs100.0*Average seed
Samoa 33 Scotland 36 Out
-0.2

What If

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

100100100100100
If finish:Chance inChance will finish regular season at seed
TPW-OTLTplayoffs12345Count
8-12Out1002,833,757,760*
Total:Out1002,833,757,760

* Row combines multiple less frequent records.

Points
Chance Will Make Playoffs

Lottery

We are out of the playoffs. Here are the big games and what ifs for draft seeds.
Although it might be more fun to go down swinging.

Big Games

Week of 9/25100.0*Lottery seed
South Africa 46 Samoa 6 +0.2
Scotland 39 United States 16 +0.0
Italy 23 Canada 18 +0.0
Australia 65 Uruguay 3 +0.0
Wales 23 Fiji 13 +0.0
France 41 Canada 18 +0.0
Week of 10/2100.0*Lottery seed
Samoa 5 Japan 26 -2.3
South Africa 34 Scotland 16 +0.2
New Zealand 43 Georgia 10 -0.1
England 13 Australia 33 -0.1
South Africa 64 United States 0 +0.1
Week of 10/9100.0*Lottery seed
Samoa 33 Scotland 36 +0.2
England 60 Uruguay 3 +0.0
New Zealand 47 Tonga 9 -0.0
If winner is:HomeTieAway
United States vs Japan+1.6+0.8-0.2
Argentina vs Namibia+0.1-0.0-0.8

What If

100100100100100100100100100100100100100100100100100100100100
If finish:Chance will finish season at seed
TPW-OTLT1234567891011121314151617181920
121-000694
100-0010100
80-010375013
Total:5761531