How are these numbers calculated?

Big Games

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

Week of 10/19100.0*Chance in playoffs100.0*Average seed
CSH 14 Clarke 22 +2.0
+1.0
Island Trees 14 Seaford 41 +0.3
Friends 7 Locust Valley 24 -0.2
-0.0
Week of 10/26100.0*Chance in playoffs100.0*Average seed
Clarke 37 VSS 0 In
+0.0
Seaford 40 East Rockaway 8 -0.3
Malverne 6 CSH 45 -0.1
Week of 11/2100.0*Chance in playoffs100.0*Average seed
Locust Valley 0 Seaford 41 -0.6
Clarke 57 Oyster Bay 14 +0.0
CSH 48 West Hempstead 13 -0.0
Games Above .500
Chance Will Make Playoffs