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负超几何随机变量期望与方差的一种简捷计算
引用本文:生志荣.负超几何随机变量期望与方差的一种简捷计算[J].大学数学,2012(1):151-153.
作者姓名:生志荣
作者单位:南京师范大学泰州学院强化培养部
基金项目:南京师范大学泰州学院《概率论与数理统计》精品课程建设项目
摘    要:给出了负超几何分布的概率模型,通过将负超几何分布随机变量进行和式分解,比较简捷地计算了它的期望和方差,并指出文献4]计算的期望和方差是错误的.

关 键 词:负超几何分布  概率分布  期望  方差

A Short-cut Method for Caculating Expectation and Variance of a Negative Hypergeometric Random Variable
SHENG Zhi-rong.A Short-cut Method for Caculating Expectation and Variance of a Negative Hypergeometric Random Variable[J].College Mathematics,2012(1):151-153.
Authors:SHENG Zhi-rong
Institution:SHENG Zhi-rong(Intensive Instruction Department,Nanjing Normal University Taizhou College,Taizhou,Jiangsu 225300,China)
Abstract:We give the probability models of negative hypergeometric distribution at first,and second we give a short-cut method for caculating its expectation and variance using the decomposition theorem of a negative hypergeometric random variable.At last we point out that the literature 4] to calculate the expectation and variance are wrong.
Keywords:negative hypergeometric distribution  probability distribution  expectation  variance
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