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