How are these numbers calculated?

Big Games

How we did yesterday and who we should root for today.   Explain

Friday100.0*Chance wins title100.0*Average seed
Norwalk 48 Ridgefield 60 +21.7
+0.4
Staples 54 Bassick 32 -3.4
-0.1
Trumbull 54 Darien 19 -0.3
Saturday100.0*Chance wins title100.0*Average seed
Staples 37 Ridgefield 40 Yes
MondayNone
Games Above .500
Chance Will Win Championship