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 6 England 30 +20.7
+1.9
France 45 USA 3 -1.5
-0.1
South Africa 31 England 24 -0.4
+1.4
New Zealand 14 Australia 10 +0.1
-0.0
Argentina 28 Samoa 16 +0.1
-0.0
Wales 26 Scotland 21 +0.1
-0.0
Ireland 19 Australia 15 -0.1
South Africa 97 USA 0 -0.1
Wales 42 Samoa 3 -0.1
New Zealand 59 Fiji 6 -0.1
Argentina 44 Scotland 13 -0.1
Ireland 46 Fiji 3 -0.0
If winner is:HomeDrawAway
Week of 6/13100.0*Chance in playoffs100.0*Average seed
England vs USAOut+11.0+4.4
+0.1-0.7-0.7
France vs South Africa+5.7+3.4Out
+0.5+0.4-0.1
Australia vs Fiji-0.6+0.6+0.6
Scotland vs Samoa-0.2+0.2+0.2
New Zealand vs Ireland+0.2-0.7-0.2
Wales vs Argentina+0.0-0.6+0.0

What If

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

100100100100100100100100100100100100
If finish:Chance inChance will finish regular season at seed
TPW-D-Lplayoffs123456789101112Count
211-0-0Out5434128,317,327,911
60-1-011.9%1288221,558,675
40-0-15.3572861,101,977,654
Total:0.9%1104730229,640,864,240
Games Above .500
Chance Will Make Playoffs