1随机变量
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随机变量 是把样本S 映射到R(实值单值)函数
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随机变量的引入可以来描述各种随机现象,并能利用数学分析的方法对随机实验的结果进行深入广泛的研究和讨论。
2离散随机变量及其分布律
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(一)(0-1)分布
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(二)伯努力试验、二项分布
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(三)泊松分布
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3 随机变量的分布函数
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计算分布函数时,根据其分布律,计算某一范围的概率时,左边x是小于不等于x的,当等于时,拆开的等式在3.1中还需要加上等于此值的概率,见例子。
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4 连续随机型变量及其概率密度
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(一)均匀分布
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(二)指数分布
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(三)正态分布
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5 随机变量的函数的分布
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用x 的函数(随机变量的函数)来表示y, y的函数分布为 x的概率密度x表示y的函数x表示y的函数的求导。
小结
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