How are these numbers calculated?

Big Games

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

Week of 5/4100.0*Average seed
St Johnstone 1 Livingston 1 -0.2
Motherwell 1 St Mirren 1 +0.1
Week of 5/11100.0*Average seed
Livingston 0 Dundee 1 -0.2
St Johnstone 2 Motherwell 0 +0.1
Week of 5/18None
Chance Will Win Championship