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 19 Australia 15 -19.5
-1.8
New Zealand 14 Australia 10 +7.3
+0.6
Wales 26 Scotland 21 +1.9
+0.0
Argentina 28 Samoa 16 +1.8
+0.0
Ireland 46 Fiji 3 +1.4
+0.1
South Africa 31 England 24 +0.7
France 45 USA 3 -0.5
South Africa 97 USA 0 -0.1
New Zealand 59 Fiji 6 -0.1
Argentina 44 Scotland 13 -0.1
Wales 42 Samoa 3 -0.1
If winner is:HomeDrawAway
Week of 6/13100.0*Chance in playoffs100.0*Average seed
Australia vs Fiji-4.0-80.3In
-1.4-2.6+1.6
France vs South Africa-37.8-20.2+5.8
-0.4-0.2+0.1
England vs USA-0.7-0.7+5.7
+0.0-0.0-0.4
Scotland vs Samoa-0.3+0.5+0.2
-0.0-0.2+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
41-0-088.3%88124,709,640,367
20-1-011.9124543221,587,307
00-0-1In881204,709,636,566
Total:92.2%436043719,640,864,240
Games Above .500
Chance Will Make Playoffs