How are these numbers calculated?

Big Games

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

Week of 4/30100.0*Average seed
Hibernian 1 St. Johnstone 2 -0.5
Week of 5/7100.0*Average seed
Hamilton 1 Hibernian 0 -0.4
Inverness CT 2 Hibernian 0 -0.2
Aberdeen 0 St. Mirren 1 +0.1
St. Johnstone 1 Hamilton 0 -0.1
Aberdeen 0 St. Johnstone 2 -0.1
Week of 5/14100.0*Average seed
Hibernian 1 Aberdeen 3 -0.7
Points
Chance Will Win Championship