How are these numbers calculated?

Big Games

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

Week of 5/9100.0*Relegated100.0*Average seed
Ross County 1 St Mirren 2 +5.2
-0.3
Week of 5/23100.0*Relegated100.0*Average seed
Kilmarnock 1 Ross County 2 +0.6
Points
Chance Will Win Championship