How are these numbers calculated?

Big Games

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

Week of 4/27100.0*Chance in playoffs100.0*Average seed
Chisnall 6 van Gerwen 6 In
Lewis 0 van Gerwen 7 In
+0.0
Week of 5/4100.0*Chance in playoffs100.0*Average seed
van Gerwen 3 Taylor 7 -0.1
Week of 5/11100.0*Chance in playoffs100.0*Average seed
van Gerwen 7 Anderson 4 +0.2
Wright 7 van Barneveld 1 -0.1
Games Above .500
Chance Will Make Playoffs