题目
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答案
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解析
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核心考点
试题【(13分)将数字分别写在大小、形状都相同的张卡片上,将它们反扣后(数字向下),再从左到右随机的依次摆放,然后从左到右依次翻卡片:若第一次就翻出数字则停止翻卡片;】;主要考察你对离散型随机变量均值与方差等知识点的理解。[详细]
举一反三
电话同时打入数ξ | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
概率P | 0.13 | 0.35 | 0.27 | 0.14 | 0.08 | 0.02 | 0.01 | 0 | 0 | 0 | 0 |
①求至少一路电话不能一次接通的概率;
②在一周五个工作日中,如果有三个工作日的这一时间内至少一路电话不能一次接通,那么公司的形象将受到损害,现用至少一路电话一次不能接通的概率表示公司形象的“损害度”,求这种情况下公司形象的“损害度”;(2)求一周五个工作日的这一时间内,同时打入的电话数ξ的期望值.
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到站的时刻 | 8:10 9:10 | 8:30 9:30 | 8:50 9:50 |
概率 | ![]() | ![]() | ![]() |
(Ⅰ)求随机变量ξ的分布列; (Ⅱ)求随机变量ξ的期望Eξ.
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