余菲

摘 要：特征函數是研究随机变量的重要工具，给出特征函数在求常见分布的期望和方差，以及证明独立随机变量和的分布具有可加性中的具体应用。

关键词：特征函数;数字特征;可加性

Abstract： The characteristic function is an important tool for studying random variables.In this paper， we use the characteristic function to obtain the expectation and variance of several conventional distributions， and prove that some distributions are additive.

Key words： characteristic function; numerical characteristics;additive property