You need to show us your work, and show us where you're stuck, before we can help you. Also, please post homework questions in the appropriate Homework Help forum.
thanks for the reply, there is no homework questions associate with this, all I need is trying to prove there is relationship between E(Π(Π-E(Π))) and var(Π), and not nesserary equal but other relationship like exponential relationship. anybody can help
Separate names with a comma.