How are these numbers calculated?

Big Games

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

Week of 3/4100.0*Chance in playoffs100.0*Qualify for EPCR Champions Cup100.0*Average seed
Harlequins 26 London Wasps 23 -27.4
-14.8
-1.2
Saracens 34 London Wasps 28 -23.7
-7.2
-0.9
London Wasps 35 Newcastle 18 +7.9
+5.2
+0.4
Northampton 31 Bath 24 -7.1
-0.1
Gloucester 34 Sale Sharks 27 +4.3
+4.2
+0.2
London Irish 32 Saracens 36 -3.9
-1.2
-0.1
Bath 45 Leicester 0 -1.8
+0.1
-0.1
Saracens 40 Sale Sharks 19 +1.0
-0.1
+0.0
Leicester 36 Newcastle 17 +0.2
+1.8
Newcastle 18 London Irish 20 +0.1
+1.4
London Irish 15 Harlequins 20 -0.1
-5.5
-0.1
Exeter 20 Leicester 24 -0.1
-0.9
+0.2
Games Above .500
Chance Will Make Playoffs