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[概率/统计] 一个有关期望的问题

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lemondian Posted at 2024-9-16 14:24:24 |Read mode
掷一枚正六面体的色子,若点数1,2,3,4朝上,则结束;若点数5或6朝上,则继续掷,直至点数点数1,2,3,4朝上为止。
求掷色子次数的期望。
能不能用kuing.cjhb.site/forum.php?mod=viewthread& … &extra=page%3D10中1#的问题(2)(ii)的递推做法?若能,如何做?

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 Author| lemondian Posted at 2024-9-16 14:26:52
kuing.cjhb.site ... amp;extra=page%3D10中1#的问题(2)(ii)的递推做法如下:
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战巡 Posted at 2024-9-16 15:14:07
请自行百度“负二项分布”

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