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 +12.9
+0.9
Friends 7 Locust Valley 24 -1.8
-0.1
Island Trees 14 Seaford 41 +1.7
Oyster Bay 37 East Rockaway 70 -1.7
-0.1
VSS 14 Malverne 32 -1.6
West Hempstead 35 Carle Place 13 +0.2
Week of 10/26100.0*Chance in playoffs100.0*Average seed
Clarke 37 VSS 0 In
+0.6
Seaford 40 East Rockaway 8 +1.4
-0.2
West Hempstead 7 Locust Valley 40 -1.2
Carle Place 0 Island Trees 31 -0.9
-0.1
Malverne 6 CSH 45 +0.2
-0.2
Week of 11/2100.0*Chance in playoffs100.0*Average seed
Locust Valley 0 Seaford 41 -0.5
CSH 48 West Hempstead 13 -0.5
Clarke 57 Oyster Bay 14 +0.2
East Rockaway 26 Island Trees 12 +0.1
Games Above .500
Chance Will Make Playoffs