How are these numbers calculated?

Big Games

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

Week of 5/28100.0*Chance in playoffs100.0*Average seed
Chile 6 Italy 50 -44.8
-0.5
Chile 18 Portugal 6 +17.1
+0.6
Portugal 26 Namibia 17 -0.4
Italy 33 Namibia 7 -0.2
-0.0
Week of 6/5100.0*Chance in playoffs100.0*Average seed
Italy 59 Portugal 13 No
+0.1
Chile 23 Namibia 21 +0.1
+0.2
Games Above .500
Chance Will Make Playoffs