How are these numbers calculated?

Big Games

How we did last week and who we should root for this week.   Explain

If winner is:HomeDrawAway
Week of 9/20100.0*Chance in playoffs100.0*Average seed
Australia vs Fiji+18.5+2.1-18.6
+2.6-0.1-2.6
Wales vs Georgia+0.0-1.4+0.0
+0.0-0.2+0.0
Fiji vs Uruguay+0.0-1.4+0.0
+0.0-0.2+0.0
Japan vs Russia+0.0-0.0-0.1
Ireland vs Scotland-0.0+0.1-0.0
Russia vs Samoa-0.0+0.1-0.0
New Zealand vs South Africa-0.0+0.1-0.0
France vs Argentina-0.0+0.1-0.0
England vs Tonga-0.0+0.1-0.0
Italy vs Canada-0.0+0.1-0.0
England vs United States-0.0+0.1-0.0
Italy vs Namibia-0.0+0.1-0.0
If winner is:HomeDrawAway
Week of 9/28100.0*Chance in playoffs100.0*Average seed
Australia vs Wales+18.5+2.1-18.6
+2.6-0.1-2.6
Georgia vs Fiji+0.0-1.4+0.0
+0.0-0.2+0.0
Georgia vs Uruguay+0.0-1.4+0.0
+0.0-0.2+0.0
Japan vs Ireland+0.0-0.0-0.1
Scotland vs Samoa-0.0+0.1-0.0
Ireland vs Russia-0.0+0.1-0.0
France vs United States-0.0+0.1-0.0
Argentina vs Tonga-0.0+0.1-0.0
South Africa vs Namibia-0.0+0.1-0.0
New Zealand vs Canada-0.0+0.1-0.0

What If

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

100100100100100100100100100100100100100100100100100100100100
If finish:Chance inChance will finish regular season at seed
TPW-OTLDplayoffs1234567891011121314151617181920Count
164-000In52351211,679,059,438
143-001In1444338000169,618,118
123-01097.1%210192220157230006,702,186,061
2-002100.01921272314510006,438,852
102-01179.7000212272811182000508,894,606
1-00385.1004152927101320108,796
82-02025.00000138121315141311620000010,053,166,654
1-01219.70002612101518171262000012,880,179
0-00413.705931725231351693
61-0210.000002924332381000508,887,904
0-0130.40001925342271000109,218
41-030Out000139151820181246,702,037,328
0-022Out000151629281746,440,354
20-031Out0006264425169,611,377
00-040Out1931591,679,058,022
Total:40.0%4555555565555555555528,198,497,600
Points
Chance Will Make Playoffs