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
Italy 33 Namibia 7 -16.4
-0.6
Portugal 26 Namibia 17 -0.4
-0.5
Chile 18 Portugal 6 -0.3
-0.0
Chile 6 Italy 50 -0.3
Week of 6/5100.0*Chance in playoffs100.0*Average seed
Chile 23 Namibia 21 -0.1
Games Above .500
Chance Will Make Playoffs