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 +44.6
+0.5
Italy 33 Namibia 7 +16.7
+0.6
Chile 18 Portugal 6 -0.3
-0.0
Portugal 26 Namibia 17 -0.1
Week of 6/5100.0*Chance in playoffs100.0*Average seed
Italy 59 Portugal 13 Yes
+0.0
Games Above .500
Chance Will Make Playoffs