| 有关数学期望计算的一个典型错误 |
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| 引用本文： | 侯文,高洋.有关数学期望计算的一个典型错误[J].数学学习,2011(3):27-28. |
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| 作者姓名： | 侯文 高洋 |
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| 作者单位： | 辽宁师范大学数学学院,辽宁大连116029 |
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| 摘 要： | 对条件期望与无条件期望混淆不分,是计算二维随机变量函数数学期望时常犯的典型错误之一,结合实例分析,指出合理利用随机变量函数数学期望的定义或全概率公式,可避免此类错误的产生.
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| 关 键 词： | 数学期望 条件期望 全概率公式 |
A Conunon Error in Calculating Mathematical Expectation |
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| HOU Wen,GAO Yang.A Conunon Error in Calculating Mathematical Expectation[J].Studies In College Mathematics,2011(3):27-28. |
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| Authors: | HOU Wen GAO Yang |
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| Institution: | (School of Mathematical Science, Liaoning Normal University, Dalian 116029, PRC) |
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| Abstract: | Confusion between conditional and unconditional expectations is one of the common causes in the calculation of expectations of a function of two-dimensional random variables. With some examples, this paper provides ways to avoid such errors by using the concept of mathematical expectation and the law of total probability. |
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| Keywords: | expectation conditional expectation law of total probability |
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