How are these numbers calculated?

Big Games

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

Week of 1/7100.0*Chance in playoffs100.0*Average seed
Connacht 66 Zebre 21 -0.1
-0.1
Racing 92 34 Leicester 3 -0.0
Racing 92 7 Munster 32 +0.0
Week of 1/14100.0*Chance in playoffs100.0*Average seed
Northampton 28 Castres 21 -0.1
Montpellier 26 Northampton 17 +0.0
Week of 1/21100.0*Chance in playoffs100.0*Average seed
Zebre 27 Wasps 41 Out
-0.0
Sale 25 Scarlets 23 -0.1
Games Above .500
Chance Will Make Playoffs