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

What If

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

100100100100100100100100100100100100100100100100100100100100
If finish:Chance inChance will finish regular season at seed
TPW-OTLDplayoffs1234567891011121314151617181920Count
164-000In52351211,679,054,084
143-001In1444338000169,632,130
123-01097.1%210192220157230006,702,056,516
2-002100.0192127231451006,437,952
102-01179.7000212272811182000508,937,067
1-00385.00041529271013200108,705
82-02025.00000138121315141311620000010,053,164,420
1-01219.70002612101518171262000012,875,732
0-00411.4146314272713400696
61-0210.000002924332381000508,894,879
0-0130.4000192534227100108,768
41-030Out000139151820181246,702,137,830
0-022Out000151629281746,439,523
20-031Out0006264425169,641,187
00-040Out1931591,679,008,111
Total:40.0%4555555565555555555528,198,497,600
Points
Chance Will Make Playoffs