How are these numbers calculated?

Big Games

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

Week of 10/11100.0*Chance wins title100.0*Average seed
Home 1 Geylang 1 +4.3
+0.1
Sengkang 0 SAFFC 2 -0.6
-0.0
Week of 10/18100.0*Chance wins title100.0*Average seed
Home 1 SAFFC 2 -20.0
-0.3
Balestier 0 Geylang 1 -15.0
-0.2
Week of 10/25100.0*Chance wins title100.0*Average seed
Geylang 3 Jurong 0 No
-0.3
Gombak 1 Home 0 No
-1.0
SAFFC 5 Woodlands 0 -0.1
Points
Chance Will Win Championship