How are these numbers calculated?

Big Games

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

Week of 5/17100.0*Average seed
St. Mirren 0 Rangers 3 -0.3
Caley Thistle 0 St. Mirren 0 -0.1
Kilmarnock 2 Falkirk 1 -0.1
Points
Chance Will Win Championship