How are these numbers calculated?

Big Games

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

Week of 11/12100.0*Average seed
Geylang 1 Hougang 2 -0.4
Hougang 0 Gombak 1 +0.2
Week of 11/17100.0*Average seed
Home 6 Balestier 1 -0.4
Points
Chance Will Win Championship