1 . 现有
人要通过化验来确定是否患有某种疾病,化验结果阳性视为患有该疾病.化验方案
:先将这
人化验样本混在一起化验一次,若呈阳性,则还要对每个人再做一次化验;否则化验结束.已知这
人未患该疾病的概率均为
,是否患有该疾病相互独立.
(1)按照方案
化验,求这
人的总化验次数
的分布列;
(2)化验方案
:先将这
人随机分成两组,每组
人,将每组的
人的样本混在一起化验一次,若呈阳性,则还需要对这
人再各做一次化验;否则化验结束.若每种方案每次化验的费用都相同,且
,问方案
和
中哪个化验总费用的数学期望更小?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
(1)按照方案
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
(2)化验方案
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7698a898a792ebf3379e1f3feb1cc2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
您最近一年使用:0次
2023-07-09更新
|
300次组卷
|
2卷引用:北京市大兴区2022-2023学年高二下学期期末考试数学试题
名校
2 . 某商场举行有奖促销活动,顾客消费每满400元,均可抽奖一次.抽奖箱里有3个红球和3个白球,这些球除颜色外完全相同.抽奖方案由如下两种,顾客自行选择其中的一种.
方案一:从抽奖箱中,有放回地每次摸取1个球,连摸2次,每摸到1次红球,获现金100元.
方案二:从抽奖箱中,一次性摸出2个球,若摸出2个红球,则获现金200元;若摸出1个红球,则获现金100元;若没摸出红球,则不获得钱.
(1)若顾客消费满400元,且选择抽奖方案一,求他所获奖金
的分布列和期望;
(2)若顾客消费满800元,且选择抽奖方案二,求他恰好获得200元奖金的概率;
(3)写出抽奖一次两种方案所获奖金期望的大小关系.(直接写出结果)
方案一:从抽奖箱中,有放回地每次摸取1个球,连摸2次,每摸到1次红球,获现金100元.
方案二:从抽奖箱中,一次性摸出2个球,若摸出2个红球,则获现金200元;若摸出1个红球,则获现金100元;若没摸出红球,则不获得钱.
(1)若顾客消费满400元,且选择抽奖方案一,求他所获奖金
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
(2)若顾客消费满800元,且选择抽奖方案二,求他恰好获得200元奖金的概率;
(3)写出抽奖一次两种方案所获奖金期望的大小关系.(直接写出结果)
您最近一年使用:0次
2021-08-04更新
|
434次组卷
|
2卷引用:北京市大兴区2020-2021学年高二下学期期末数学试题
3 . 如图,某兴趣小组为测量河对岸直塔高AB,选取与塔底B在同一水平面内的两个测量基点C与D,
,
,可测的量有
,
,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2022/4/29/2968755437486080/2972126576156672/STEM/025d4339-75d2-44b9-84ad-1c662c32a338.png?resizew=160)
(1)若
,
,
,
,求塔高AB;
(2)用m,
,
,
表示塔高AB;
(3)现有下列四个测量方案:
方案①测量
,
,
,
;方案②测量
,m,
,
;
方案③测量
,
,m,
;方案④测量m,
,
,
.
其中,能使塔高AB可求的所有方案的编号为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8915e8e775538d41debf1933102c6b86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0369e9ef206b11b1866147607e0a5af1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec66384de001ccfd86e935ddcfe1033d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4465cef54ed3fdd1f195a9e0baab0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73fbf6c13e28b4c23da76ae056251618.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77e360a55b18be925d7bb41694d5d4d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc6ba951e379fa445714de2ed5a09a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ee2c2082e35f409e2a5280a7ed34c2.png)
![](https://img.xkw.com/dksih/QBM/2022/4/29/2968755437486080/2972126576156672/STEM/025d4339-75d2-44b9-84ad-1c662c32a338.png?resizew=160)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/711b21672fd907c5c92fee1d649e7003.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c42206793edde00d2d43cd07adf78366.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a886977df543a21db820b1c9adbb0d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c2e918786903f9a986ddc613d390645.png)
(2)用m,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
(3)现有下列四个测量方案:
方案①测量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6581916f5a65edfea257c804efee007e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6581916f5a65edfea257c804efee007e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f435efcc7869eec21bdba1ed81dc3f5.png)
方案③测量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6581916f5a65edfea257c804efee007e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/700458c01a7ad031e27d80ed43e9e882.png)
其中,能使塔高AB可求的所有方案的编号为______.
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