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*Chance wins title
Hearts 1 Celtic 3 +0.2
Aberdeen 4 Motherwell 1 -0.2
Week of 5/7100.0*Chance wins title
Celtic 3 Aberdeen 2 Yes
Week of 5/14None
Points
Chance Will Win Championship