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Probability mass function
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概率质量函数 (Probability mass function)

简介

在概率论中,概率质量函数是离散随机变量在各特定取值上的概率。概率质量函数和概率密度函数不同之处在于:概率质量函数是对离散随机变量定义的,本身代表该值的概率;概率密度函数本身不是概率,只有对连续随机变量的概率密度函数在某区间内进行积分后才是概率。 维基百科

其他用户还问了以下问题

在概率论中,概率质量函数(probability mass function,简写作pmf)是离散随机变量在各特定取值上的概率。概率质量函数和概率密度函数不同之处在于:概率质量函数是对 ...
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P(2≤Y<5): =∑4k=2PY(k)
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