How are these numbers calculated?

Big Games

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

Week of 6/5100.0*Chance in playoffs100.0*Average seed
France 45 USA 3 +43.0
+1.6
South Africa 97 USA 0 -19.3
-1.8
South Africa 31 England 24 -1.7
-0.1
New Zealand 14 Australia 10 +0.4
+0.0
Argentina 28 Samoa 16 +0.3
+0.0
Wales 26 Scotland 21 +0.3
+0.0
Ireland 46 Fiji 3 +0.1
+0.0
Argentina 44 Scotland 13 -0.1
Ireland 19 Australia 15 -0.1
New Zealand 59 Fiji 6 -0.1
Wales 42 Samoa 3 -0.1
If winner is:HomeDrawAway
Week of 6/13100.0*Chance in playoffs100.0*Average seed
England vs USA-0.2+1.1+1.6
Australia vs Fiji+0.1-0.1-0.1
Scotland vs Samoa+0.1-0.1-0.1

What If

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

100100100100100100100100100100100100
If finish:Chance inChance will finish regular season at seed
TPW-D-Lplayoffs123456789101112Count
41-0-0In1001,101,977,654
20-1-0In54451221,558,675
00-0-1In117828,317,327,911
Total:In1416719,640,864,240
Games Above .500
Chance Will Make Playoffs