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 +25.1
+0.8
Scotland 39 United States 16 -1.6
-0.0
Week of 10/2100.0*Chance in playoffs100.0*Average seed
South Africa 34 Scotland 16 +30.6
+0.8
South Africa 64 United States 0 In
+0.5
Samoa 5 Japan 26 -3.6
-0.0
Week of 10/9None

What If

Chances based on how well the South Africa 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