How are these numbers calculated?

Big Games

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

Week of 5/9100.0*Average seed
St Johnstone 1 Dundee Utd 1 -0.1
St Johnstone 0 Celtic 0 +0.1
Hamilton 1 Partick Thistle 1 +0.0
Week of 5/23100.0*Average seed
Aberdeen 0 St Johnstone 1 +0.5
Dundee Utd 3 Dundee 0 -0.3
Points
Chance Will Win Championship