| 负超几何随机变量期望与方差的一种简捷计算 |
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| 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, 28(1): 151-153. DOI: 10.3969/j.issn.1672-1454.2012.01.031 |
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| 作者姓名： | 生志荣 |
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| 作者单位： | 南京师范大学泰州学院强化培养部,江苏泰州,225300 |
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| 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 |
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| 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.
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| 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 |
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| SHENG Zhi-rong. A Short-cut Method for Caculating Expectation and Variance of a Negative Hypergeometric Random Variable[J]. College Mathematics, 2012, 28(1): 151-153. DOI: 10.3969/j.issn.1672-1454.2012.01.031 |
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| Authors: | SHENG Zhi-rong |
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| Affiliation: | SHENG Zhi-rong(Intensive Instruction Department,Nanjing Normal University Taizhou College,Taizhou,Jiangsu 225300,China) |
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| 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. |
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| Keywords: | negative hypergeometric distribution probability distribution expectation variance |
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