How are these numbers calculated?

Big Games

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

Week of 3/10100.0*Average seed
Wales 22 Ireland 9 +0.1
Week of 3/11100.0*Average seed
England 61 Scotland 21 +0.1
Week of 3/18None
Games Above .500
Chance Will Make Playoffs