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 +0.1
Motherwell 1 St Mirren 1 +0.0
Week of 5/11100.0*Average seed
St Johnstone 2 Motherwell 0 +0.5
Week of 5/18100.0*Average seed
Hamilton Accies 2 St Johnstone 0 -0.4
Celtic 2 Hearts 1 +0.4
Points
Chance Will Win Championship