2013·江西赣州·三模
1 . PM2.5是指悬浮在空气中的空气动力学当量直径小于或等于2.5微米的颗粒物,也称为可入肺颗粒物.根据现行国家标准GB3095-2012, PM2.5日均值在35微克/立方米以下空气质量为一级;在35~75微克/立方米之间空气质量为二级;在75微克/立方米以上空气质量为超标.从某自然保护区2012年全年每天的PM2.5监测值数据中随机地抽取12天的数据作为样本,监测值频数如茎叶图所示(十位为茎,个位为叶):
![](https://img.xkw.com/dksih/QBM/2013/7/15/1571280626343936/1571280632012800/STEM/0638c182c7604425b6010ede01558f24.png)
(I)求空气质量为超标的数据的平均数与方差;
(II)从空气质量为二级的数据中任取2个,求这2个数据的和小于100的概率;
(III)以这12天的PM2.5日均值来估计2012年的空气质量情况,估计2012年(366天)大约有多少天的空气质量达到一级或二级.
![](https://img.xkw.com/dksih/QBM/2013/7/15/1571280626343936/1571280632012800/STEM/0638c182c7604425b6010ede01558f24.png)
(I)求空气质量为超标的数据的平均数与方差;
(II)从空气质量为二级的数据中任取2个,求这2个数据的和小于100的概率;
(III)以这12天的PM2.5日均值来估计2012年的空气质量情况,估计2012年(366天)大约有多少天的空气质量达到一级或二级.
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2013·江西南昌·二模
2 . 从某节能灯生产在线随机抽取100件产品进行寿命试验,按连续使用时间(单位:天)共分5组,得到频率分布直方图如图.
![](https://img.xkw.com/dksih/QBM/2013/5/23/1571225757294592/1571225762971648/STEM/06fae7776ab54161b772228791bd422e.png)
(I)以分组的中点资料作为平均数据,用样本估计该生产线所生产的节能灯的预期连续使用寿命;
(II)为了分析使用寿命差异较大的产品,从使用寿命低于200天和高于350天的产品中用分层抽样的方法共抽取6件,求样品A被抽到的概率.
![](https://img.xkw.com/dksih/QBM/2013/5/23/1571225757294592/1571225762971648/STEM/06fae7776ab54161b772228791bd422e.png)
(I)以分组的中点资料作为平均数据,用样本估计该生产线所生产的节能灯的预期连续使用寿命;
(II)为了分析使用寿命差异较大的产品,从使用寿命低于200天和高于350天的产品中用分层抽样的方法共抽取6件,求样品A被抽到的概率.
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2013·黑龙江哈尔滨·模拟预测
名校
3 . 天水市第一次联考后,某校对甲、乙两个文科班的数学考试成绩进行分析,规定:大于或等于120分为优秀,120分以下为非优秀.统计成绩后,得到如下的
列联表,且已知在甲、乙两个文科班全部110人中随机抽取1人为优秀的概率为
.
(1)请完成上面的列联表;
(2)根据列联表的数据,若按99.9%的可靠性要求,能否认为“成绩与班级有关系”;
(3)若按下面的方法从甲班优秀的学生中抽取一人:把甲班优秀的10名学生从2到11进行编号,先后两次抛掷一枚均匀的骰子,出现的点数之和为被抽取人的序号.试求抽到9号或10号的概率.
参考公式与临界值表:
.
![](https://img.xkw.com/dksih/QBM/2013/8/13/1571315442302976/1571315447980032/STEM/c2322432aecd4628ac76cd550cf77b67.png?resizew=32)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9d357ea085a587a9f975e30e710e4ac.png)
优秀 | 非优秀 | 合计 | |
甲班 | 10 | ||
乙班 | 30 | ||
合计 | 110 |
(1)请完成上面的列联表;
(2)根据列联表的数据,若按99.9%的可靠性要求,能否认为“成绩与班级有关系”;
(3)若按下面的方法从甲班优秀的学生中抽取一人:把甲班优秀的10名学生从2到11进行编号,先后两次抛掷一枚均匀的骰子,出现的点数之和为被抽取人的序号.试求抽到9号或10号的概率.
参考公式与临界值表:
![](https://img.xkw.com/dksih/QBM/2013/8/13/1571315442302976/1571315447980032/STEM/6ffe8d80806140dba30edbec444d5ccc.png?resizew=207)
![]() | 0.100 | 0.050 | 0.025 | 0.010 | 0.001 |
![]() | 2.706 | 3.841 | 5.024 | 6.635 | 10.828 |
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2016-12-02更新
|
1894次组卷
|
18卷引用:江西省赣州市红色七校2017-2018届高三第一次联考数学(文)试题
江西省赣州市红色七校2017-2018届高三第一次联考数学(文)试题(已下线)2013届黑龙江省哈尔滨市第九中学高三第四次模拟考试理科数学试卷(已下线)2019年3月10日 《每日一题》(理)二轮复习-每周一测(已下线)2019年3月17日 《每日一题》文科二轮复习 每周一测【校级联考】江西省南昌市八一中学、洪都中学、麻丘高中等七校2018-2019学年高二下学期期中考试数学(文)试题甘肃省武威市凉州区2022届高三下学期质量检测数学(文)试题江西省抚州市金溪县第一中学2021-2022学年高二下学期第二次月考数学(理)试题湖南省邵阳市邵东一中2024届高三上学期第四次月考数学试题(已下线)2012-2013年辽宁沈阳铁路实验中学高二下学期期中考试文科数学试卷(已下线)2012-2013学年甘肃天水一中高二下学期期末考试文科数学试卷湖北省黄冈市2016-2017学年高二下学期期末考试数学(文)试题湖北省黄冈市2016-2017学年高二下学期期末考试文科数学试题河南省商丘市九校2017-2018学年高二下学期期末联考数学(理)试题河北省巨鹿县二中2017-2018学年高二下学期期末考试数学(文)试题河南省开封市通许县实验中学2017-2018学年高二下学期期末考试数学(理)试题新疆奎屯市第一高级中学2018-2019学年高二下学期第一次月考数学(文)试题河南省林州市林虑中学2019-2020学年高二下学期开学检测数学(文)试题吉林省延边市长白山第一高级中学2019-2020学年高二下学期验收考试数学(文)试卷
12-13高二上·黑龙江大庆·期末
4 . 某日用品按行业质量标准分成五个等级,等级系数X依次为1,2,3,4,5.现从一批该日用
品中随机抽取20件,对其等级系数进行统计分析,得到频率分布表如下:
(I)若所抽取的20件日用品中,等级系数为4的恰有3件,等级系数为5的恰有2件,
求a,b,c的值;
(Ⅱ)在(I)的条件下,将等级系数为4的3件日用品记为x1,x2,x3,等级系数为5的2件
日用品记为y1,y2,现从x1,x2,x3,y1,y2这5件日用品中任取两件(假定每件日用品被取出
的可能性相同),写出所有可能的结果,并求这两件日用品的等级系数恰好相等的概率
品中随机抽取20件,对其等级系数进行统计分析,得到频率分布表如下:
X | 1 | 2 | 3 | 4 | 5 |
频率 | a | 0.2 | 0.4 | b | c |
求a,b,c的值;
(Ⅱ)在(I)的条件下,将等级系数为4的3件日用品记为x1,x2,x3,等级系数为5的2件
日用品记为y1,y2,现从x1,x2,x3,y1,y2这5件日用品中任取两件(假定每件日用品被取出
的可能性相同),写出所有可能的结果,并求这两件日用品的等级系数恰好相等的概率
您最近一年使用:0次
2016-12-01更新
|
946次组卷
|
12卷引用:2012届江西省重点中学高三第一次统考文科数学
(已下线)2012届江西省重点中学高三第一次统考文科数学(已下线)2012届河北省唐山一中高三第一次高考仿真测试文科数学试卷(已下线)2013届河南省中原名校高三下学期第二次联考文科数学试卷2011年普通高等学校招生全国统一考试文科数学(福建卷)2016届湖南省长沙市雅礼中学高三月考三文科数学试卷【全国百强校】河北省武邑中学2018届高三下学期第一次模拟考试数学(文)试题2019届天津市新华中学高三第10次统练数学(文)试题(已下线)2011—2012学年度黑龙江大庆实验中学高二上学期期末考试文科数学试卷2015-2016学年辽宁省沈阳二十一中高二上10月月考理科数学试卷2015-2016学年辽宁省沈阳二十一中高二上10月月考文科数学试卷河南省安阳市第三十五中学2016-2017学年高一下学期期末考试数学试题广西象州县中学2019-2020学年高一5月教学质量检测数学试题
2011·江西南昌·三模
解题方法
5 . 连续掷两次骰子分别得到的点数为
n,则点
m, n) 在直线
左下方的概率为_____________ .
![](https://img.xkw.com/dksih/QBM/2012/7/3/1570912597450752/1570912600449024/STEM/d0583bc52c5c4e59855697b611e41a67.png?resizew=23)
![](https://img.xkw.com/dksih/QBM/2012/7/3/1570912597450752/1570912600449024/STEM/9b84c381afa54851a69a93787c4bcac6.png?resizew=23)
![](https://img.xkw.com/dksih/QBM/2012/7/3/1570912597450752/1570912600449024/STEM/dd165a354c6a4e74a4ce5394366a304a.png?resizew=65)
您最近一年使用:0次
真题
6 . 如图,从
,
,
,
,
,
,这6个点中随机选取3个点.(1)求这3点与原点
恰好是正三棱锥的四个顶点的概率;(2)求这3点与原点
共面的概率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1f06521b4550cb28a9c4872e606608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd5483c231dedf6ccc7e0c229edd3b8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3076af2d00062b1b496d83fbda2575ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5be7a965a7fe348d9ae7f9db2b0cf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41abcb76300876e91cf1957233197183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1587f43b5b0f02fd8a45fa1add9c15f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/2012/6/20/1570893974650880/1570893980221440/STEM/96a1a715-4ccb-43a9-99d9-db6101b4129d.png?resizew=166)
您最近一年使用:0次
2010·北京海淀·二模
7 . 某园林局对1000株树木的生长情况进行调查,其中槐树600株,银杏树400株. 现用分层抽样方法从这1000株树木中随机抽取100株,其中银杏树树干周长(单位:cm)的抽查结果如下表:
(I)求
的值 ;
(II)若已知树干周长在30cm至40cm之间的4株银杏树中有1株患有虫害,现要对这4株树逐一进行排查直至找出患虫害的树木为止.求排查的树木恰好为2株的概率.
树干周长(单位:cm) | ![]() | ![]() | ![]() | ![]() |
株数 | 4 | 18 | ![]() | 6 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(II)若已知树干周长在30cm至40cm之间的4株银杏树中有1株患有虫害,现要对这4株树逐一进行排查直至找出患虫害的树木为止.求排查的树木恰好为2株的概率.
您最近一年使用:0次
解题方法
8 . 某校高三文科
名学生参加了
月份的模拟考试,学校为了了解高三文科学生的数学、语文情况,利用随机数表法从中抽取
名学生的成绩进行统计分析,抽出的
名学生的数学、语文成绩如下表.
![](https://img.xkw.com/dksih/QBM/2016/11/24/1573175102668800/1573175108468736/STEM/f3283f214f89429eb4dce3557605b60d.png?resizew=276)
(1)将学生编号为:
,若从第
行第
列的数开始右读,请你依次写出最先抽出的
个人的编号(下面是摘自随机用表的第四行至第七行)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8da45c443af7994a26ffa9d8894e7262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b36fb43923326b42462c2b53c52c372.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83fd1dadbe1b2cafc0cf8b5bb8b18ed9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e9ba3f640f57c0cece089dfd19b4970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c696d722e1b4b938c7a956ff83f733bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15e398a06d8ffa9071cf32c3e9e73a1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd2142368b10234525598c5c32dad846.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c2f0486c5492c0a71c2e63edcb60033.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb0295015d3e43917b6e72ab75689b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feda926749de04fa585f73f84c568f0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f39054cc80af34bb4aea2f7fd075f5af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34584b79ec2246f47aeed8855d2762c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e3026c4e35dbfedd67de36f122bf5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49e60fbe6820130fb20abc555a94b5ea.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ef0a9f421547e737ec464d29b314403.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4500d4031cbf22a456fa09fa393ba2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13331651b4e0d36a2f3a32b4d1a767e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc06849d2a73578c134e6065ab5a9586.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bab424495590c9dfe320f4d85c48177f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/233efdb759ff0cb413c7a539f4895c38.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4a5350d42c3d9982d27c59d7e9eb673.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ec714b7d7a203ecbcef9232ee7d40da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e6f1af4b44b2e97e8f319bab4ae9010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06fc7811f9525e8b8c833746d6af5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e97b325f43a8d0975cb2fb0c59a36b2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d0c86435b0b5f7dabce768a0790c346.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8da45c443af7994a26ffa9d8894e7262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34a8c7954d594263b44e2879ab6b33a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4a5350d42c3d9982d27c59d7e9eb673.png)
(2)若数学优秀率为
,求
的值;
(3)在语文成绩为良的学生中,已知
,求数学成绩“优”比“良”的人数少的概率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/821b8672d030c240ff230a0174aa7a3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
![](https://img.xkw.com/dksih/QBM/2016/11/24/1573175102668800/1573175108468736/STEM/f3283f214f89429eb4dce3557605b60d.png?resizew=276)
(1)将学生编号为:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06265287273fe4d9d5d310bd9f6cfc96.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/8da45c443af7994a26ffa9d8894e7262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b36fb43923326b42462c2b53c52c372.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83fd1dadbe1b2cafc0cf8b5bb8b18ed9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e9ba3f640f57c0cece089dfd19b4970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c696d722e1b4b938c7a956ff83f733bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15e398a06d8ffa9071cf32c3e9e73a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15e398a06d8ffa9071cf32c3e9e73a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5addb4c35fcfb719f6da39fff93c2497.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/417ef963f7042f5648acebc2f38246f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34584b79ec2246f47aeed8855d2762c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a55d686d4bbdac89c76e4ec4f6ef5e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26938a68a24298952b1ce2e8a794f059.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6620729a37129c16cfd61cd59500bfe1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e3026c4e35dbfedd67de36f122bf5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8da45c443af7994a26ffa9d8894e7262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/180ea775f2af05650404d764384e7faa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1834490aacbee800ed5721312f4be1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ef0a9f421547e737ec464d29b314403.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c696d722e1b4b938c7a956ff83f733bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e180966d709439a215f1232d17aedf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b7073684723741238b95b3b9d3b5301.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4a5350d42c3d9982d27c59d7e9eb673.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92128c6c226ce688bc160fb86854f2fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b547f16d2f76bda1abb5476684ed642.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b36fb43923326b42462c2b53c52c372.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba505969331b28f0e2d3047d49988914.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/332e71982612ea86c28b9f2054b1045c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26a49a952a95f7af7d8b4bc55f0fbe03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd2142368b10234525598c5c32dad846.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cbcf82603580ddba4cfdb4efde85a8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8f70f0c1b960fa850d67c4091e04400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f76fba0fe83cf0aa9a68210591cac1a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34584b79ec2246f47aeed8855d2762c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88169351407d18d82e18bbe6c10f0dd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c2f0486c5492c0a71c2e63edcb60033.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9540adc0ff403bdc40ec109f96ec99ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a17161b28b6ad8f57abc5b11e1b6c671.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34a8c7954d594263b44e2879ab6b33a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b837fd9c52f60bfb3b6852733abc790.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/814397354c2ae1cb08e0271305970811.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e180966d709439a215f1232d17aedf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd2142368b10234525598c5c32dad846.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c2f0486c5492c0a71c2e63edcb60033.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb0295015d3e43917b6e72ab75689b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c696d722e1b4b938c7a956ff83f733bd.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6d314c287aa376240f0ca41bd181f01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/332e71982612ea86c28b9f2054b1045c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91488a5bb578d001827a4fd7a66b0592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735e839cc67c5cadcd83635a87628937.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feda926749de04fa585f73f84c568f0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f39054cc80af34bb4aea2f7fd075f5af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34584b79ec2246f47aeed8855d2762c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e3026c4e35dbfedd67de36f122bf5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49e60fbe6820130fb20abc555a94b5ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92128c6c226ce688bc160fb86854f2fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34a8c7954d594263b44e2879ab6b33a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ef0a9f421547e737ec464d29b314403.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4500d4031cbf22a456fa09fa393ba2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13331651b4e0d36a2f3a32b4d1a767e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc06849d2a73578c134e6065ab5a9586.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bab424495590c9dfe320f4d85c48177f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/233efdb759ff0cb413c7a539f4895c38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1834490aacbee800ed5721312f4be1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4a5350d42c3d9982d27c59d7e9eb673.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ec714b7d7a203ecbcef9232ee7d40da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e6f1af4b44b2e97e8f319bab4ae9010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06fc7811f9525e8b8c833746d6af5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e97b325f43a8d0975cb2fb0c59a36b2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d0c86435b0b5f7dabce768a0790c346.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8da45c443af7994a26ffa9d8894e7262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34a8c7954d594263b44e2879ab6b33a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4a5350d42c3d9982d27c59d7e9eb673.png)
(2)若数学优秀率为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38ff2cca31ea3c1b99e23e4049b5044a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
(3)在语文成绩为良的学生中,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4489d8b38621bf118184ab6275f10ba.png)
您最近一年使用:0次
2016-11-23更新
|
343次组卷
|
2卷引用:2017届江西吉安一中高三上期中考试文数试卷
2010·重庆·一模
真题
9 . 将7个人(含甲、乙)分成三个组,一组3人,另两组2人,不同的分组数为
,甲、乙分到同一组的概率为
,则
的值分别为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/198dd107cedc476f9584e50fb58175e4.png)
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
您最近一年使用:0次
2011-11-14更新
|
1366次组卷
|
6卷引用:2006 年普通高等学校招生考试数学(理)试题(江西卷)
2006 年普通高等学校招生考试数学(理)试题(江西卷)(已下线)2010年普通高等学校招生全国统一考试(重庆卷)数学文史类模拟试卷(三)(已下线)2012届高三一轮精品复习单元测试(11)数学试卷沪教版(上海) 高三年级 新高考辅导与训练 第六章 概率 一、古典概率和互斥事件的概率(已下线)2011年四川省绵阳中学高二下学期第一次月考数学试卷(已下线)2010-2011年四川省绵阳中学高二下学期第一次月考数学试卷