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
Ireland 46 Fiji 3 +24.3
+1.6
New Zealand 59 Fiji 6 -19.5
-1.8
New Zealand 14 Australia 10 -10.4
-0.2
Argentina 28 Samoa 16 +1.5
+0.1
Wales 26 Scotland 21 +1.4
+0.1
South Africa 31 England 24 +0.9
+0.1
France 45 USA 3 -0.5
Ireland 19 Australia 15 -0.1
Wales 42 Samoa 3 -0.1
Argentina 44 Scotland 13 -0.1
South Africa 97 USA 0 -0.1
If winner is:HomeDrawAway
Week of 6/13100.0*Chance in playoffs100.0*Average seed
Australia vs FijiInIn-47.3
+1.4+2.4-1.5
Scotland vs Samoa-3.7+13.5+3.0
-0.0+0.3-0.0
France vs South Africa-3.7-3.7+3.8
-0.2-0.2+0.2
England vs USA+0.2-0.2-0.2

What If

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

100100100100100100100100100100100100
If finish:Chance inChance will finish regular season at seed
TPW-D-Lplayoffs123456789101112Count
41-0-07.5%837561,571,975,533
20-1-0In5049173,946,301
00-0-1In636581,571,987,582
Total:54.8%41928418273,217,909,416
Games Above .500
Chance Will Make Playoffs