The Calculation Method of Digital Characteristics of Discrete Random Variable
Zhao Tian-y · Journal of Yangtze University · 2013
The digital characteristics of random variables describes the whole feature of random variables,therefore studying calculation method of digital characteristics of random variables is very necessary.In this paper,the discrete random variable as the research object,the generating function as a research tool,the calculation method of mathematical expectation and variance of discrete random variable are discussed,it gives three kinds of calculating methods,including formula method,random variable decomposition method and generating function method.