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
Wales 42 Samoa 3 -19.5
-1.8
Argentina 28 Samoa 16 -2.0
France 45 USA 3 -1.5
New Zealand 14 Australia 10 +0.9
+0.0
Wales 26 Scotland 21 +0.3
+0.0
South Africa 31 England 24 +0.3
Ireland 46 Fiji 3 +0.2
+0.0
Argentina 44 Scotland 13 -0.1
Ireland 19 Australia 15 -0.1
South Africa 97 USA 0 -0.1
New Zealand 59 Fiji 6 -0.1
If winner is:HomeDrawAway
Week of 6/13100.0*Chance in playoffs100.0*Average seed
Scotland vs SamoaInIn-42.0
+1.6+2.1-1.7
Australia vs Fiji-8.7+4.2+8.5
+0.0-0.2-0.0
France vs South Africa-8.7-8.7+1.4
-0.2-0.2+0.0
England vs USA+0.1-0.4-0.4

What If

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

100100100100100100100100100100100100
If finish:Chance inChance will finish regular season at seed
TPW-D-Lplayoffs123456789101112Count
41-0-017.8%1845384,709,773,268
20-1-0In60364221,577,371
00-0-1In3149204,709,513,601
Total:59.8%162510922189,640,864,240
Games Above .500
Chance Will Make Playoffs