设随机变量 )，记 ，则的密度函数 为。https://img-ph-mirror.nosdn.127.net/ePcHOcmdoHIDoMt9jLIn2g==/6631702183909111121.pnghttps://img-ph-mirror.nosdn.127.net/_HG7V_e5OPtONcYCrJRirQ==/6631573541048662542.pnghttps://img-
设随机变量 )，记 ，则的密度函数 为。https://img-ph-mirror.nosdn.127.net/ePcHOcmdoHIDoMt9jLIn2g==/6631702183909111121.pnghttps://img-ph-mirror.nosdn.127.net/_HG7V_e5OPtONcYCrJRirQ==/6631573541048662542.pnghttps://img-
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