How are these numbers calculated?

Big Games

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

Week of 4/28100.0*Average seed
Motherwell 5 St. Johnstone 1 -0.4
Celtic 1 St. Johnstone 0 -0.3
Rangers 5 Dundee Utd 0 +0.1
Hearts 0 Motherwell 1 +0.0
Week of 5/5100.0*Average seed
Hearts 2 St. Johnstone 0 -0.4
Dundee Utd 1 Celtic 0 -0.1
Week of 5/13100.0*Average seed
St. Johnstone 0 Rangers 4 -0.3
Celtic 5 Hearts 0 +0.1
Points
Chance Will Win Championship