The convergence to normal distribution of random sums of independent random variables with finite variances

Abstract

Let (Xnk) be a double sequence of random variables with finite variances. Let (Zn) be a sequence of positive integral-valued random variables such that for each n, Zn, Xn1, Xn2,... are independent and Unk = 0, where Unk is the expectation of Xnk. In this study, we give necessary and sufficient conditions for weak convergence of the distribution functions of random sums Xn1 + Xn2 + ... + XnZn to the standard normal distribution function.