what is the joint moment generating function joint moment generating function calculation of joint moment calculate mff what is mgf how to determine joint moment generating function how to determine the joint moment generating function what is joint moment generating function which random variable does the joint moment generation function include what is the joint moment-generating function? calculate joint moment generating function how to find the joint moment function what is joint moment generating function calculating joint moment generating function calculate joint moment generating function how to calculate joint moment generating function how to calculate joint moment generating function what is mgf in probability what is joint moment generating function why is joint moment generating function not equal