The Asymptotic Distribution of Randomly Weighted Sums and Self-normalized Sums

We consider the self-normalized sums $T_{n}=\sum_{i=1}^{n}X_{i}Y_{i}/\sum_{i=1}^{n}Y_{i}$, where ${Y_{i} : i\geq 1}$ are non-negative i.i.d. random variables, and ${X_{i} : i\geq 1}$ are i.i.d. random variables, independent of ${Y_{i} : i \geq 1}$. The main result of the paper is that each subsequential limit law of T_n$is continuous for any non-degenerate$X_1$with finite expectation, if and only if$Y_1$ is in the centered Feller class.

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