what is the erlang distribution used for which theorem states that the sum of what is theorem of an exponential distribution what is the proof that the sum of n independent variables following an exponential distribution follows a gamma distribution? what is theorem gamma distribution which theorem shows that the sum of independent variable n follows an exponential distribution what a gamma distribution follows how to cite exponential what is the gamma distribution in exponential theorem what type of theorem is the sum of n independent variables following an exponential distribution what proof can i cite for the proof that the sum of n independent variables following an exponential distribution follows an exponential distribution? which term refers to the sum of n independent variable following an exponential distribution what is theorem for exponential what is erlang and what is the proof of this theorem if exponential distribution has an exponential distribution which is also called what theorem is proof that the sum of exponential variables follows a gamma distribution? which theorem is based on exponential distributions which theorem is commonly used in exponential distributions? what is the theorem of the gamma distribution in math what is theorem for exponential distribution