#stats #math 

![[Pasted image 20210929144959.png]]

pg 95 of [[Mathematical statistics with applications by Dennis D. Wackerly, William Mendenhall, Richard L. Scheaffer (z-lib.org).pdf]]

This is way simplified by $V(Y)=E(Y^2)-E(Y)^2 =E(Y^2)-\mu_Y^2$