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
New Zealand 14 Australia 10 +24.3
+2.0
Ireland 19 Australia 15 -19.5
-1.8
South Africa 31 England 24 +1.6
+0.0
Wales 26 Scotland 21 +1.4
+0.0
Argentina 28 Samoa 16 +1.4
+0.0
Ireland 46 Fiji 3 -0.5
+0.2
France 45 USA 3 -0.2
South Africa 97 USA 0 -0.1
France 6 England 30 -0.1
Argentina 44 Scotland 13 -0.1
Wales 42 Samoa 3 -0.1
New Zealand 59 Fiji 6 -0.1
If winner is:HomeDrawAway
Week of 6/13100.0*Chance in playoffs100.0*Average seed
Australia vs Fiji-10.8-78.7In
-1.3-2.5+1.4
France vs South Africa-12.8+7.4+12.5
-0.1+0.1+0.1
England vs USA-11.8-11.8+12.3
+0.1+0.0-0.1
Scotland vs Samoa-0.2+0.8+0.1
+0.0-0.3+0.0

What If

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

100100100100100100100100100100100100
If finish:Chance inChance will finish regular season at seed
TPW-D-Lplayoffs123456789101112Count
41-0-074.8%75251,571,987,582
20-1-06.87435073,946,301
00-0-1In504911,571,975,533
Total:85.5%24240371313,217,909,416
Games Above .500
Chance Will Make Playoffs