How are these numbers calculated?

Big Games

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

Week of 9/20100.0*Chance in playoffs100.0*Average seed
Charleston 2 Miami 0 In
+0.1
Week of 9/30100.0*Chance in playoffs100.0*Average seed
Miami 4 Charleston 3 -0.2
Week of 10/3None
Points
Chance Will Make Playoffs