Calculate Mean, please notice MEAN, of two OR SEVERAL probabilitY density functions

Hello I have created several pdf's using the formula below (60 pdf's). I would like to calculate the mean of all these pdfs but I have not idea how to do this.

Here is the formula I used to create each of the pdfs, L1 is a structure that contain a matrix that contain the Z values. I used in this example the structure L1(1), I have 60 more of these structures so they go from L1(1).Z to L1(60).Z, I calculated pdf's for each of these pupulations of Z.

%pdf for the structure L1(1).Z
pd = fitdist(L1(1).Z(:),'Normal');
x_pdf = [min(L1(1).Z(:)):0.01:max(L1(1).Z(:))];
y = pdf(pd,x_pdf);

Thanks in advance for any help

PLEASE NOTICE THIS QUESTION IS NOT DUPL;ICATED, HERE I AM ASKING FOR THE MEAN OF SEVERAL PROBAILITY DENSITIES.