名校
解题方法
1 . 某校高二年级男生的身高
(单位:cm)近似服从正态分布
,若X的值在
内的概率约为0.84,则n的值约为( )
参考数据:①
;②
;③![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3280373a54d4b00138c803698ec60b74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e1c1182d2556a3fce71222d7176a31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764fecbfa1725b3b11e465c577069e11.png)
参考数据:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e97705bedd45b860523d4fac71b64100.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/491c4b275f466e0ef3d15d61e471e34d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3280373a54d4b00138c803698ec60b74.png)
A.3 | B.4 | C.5 | D.6 |
您最近一年使用:0次
名校
解题方法
2 .
月
日是世界睡眠日,
年世界睡眠日的中国主题是“良好睡眠,健康同行”.中国睡眠研究会常务理会吕云辉教授围绕这一主题进行了深度解读,以严谨的理论和丰富的案例佐证了良好睡眠于健康体魄的重要性.某中学数学兴趣小组为了研究良好睡眠与学习状态的关系,调查发现该校
名学生平均每天的睡眠时间
,则该校每天平均睡眠时间为
小时的学生人数约为( )(结果四舍五入保留整数)
附:若
,则
,
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1834490aacbee800ed5721312f4be1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d01dd350dc95f42f1883e0cc7aae084.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfce2106c9ad85e4965af5d95c9bf4d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1426cbb6938539b528a007ff56870dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/788ac5b752316ecc35c3eb8db3852969.png)
附:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c1ed67167078ea4f5f1ee53ee14164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0720f175f4b43c24d56020a88cc868d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f34a3ae5780813e33c785c24f1d76df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89485c39114b81f3839c931b29ae2a9.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2022-07-07更新
|
323次组卷
|
4卷引用:吉林省四平市第三高级中学2022-2023学年高二下学期6月月考数学试题
解题方法
3 . 在某次高三联考中,学生的数学成绩服从正态分布
.已知参加本次考试的学生有
人.则本次考试数学成绩大于
分的大约有___________ 人.
(参考数据:
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c6eb5f8fe96c1929021bab021b163b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1926eb08a21a8b6558fcfd4c52a4a23b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5978fb60a59b0bee67480dfc7544a087.png)
(参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/535bb71713682930aa72c0f56663342a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d2ddcf8276bf113481523a6d7552ba1.png)
您最近一年使用:0次
2022-06-21更新
|
457次组卷
|
2卷引用:吉林省长春博硕学校2022-2023学年高二下学期期中考试数学试题
名校
4 . 某地区
名高三学生在某次模拟考试中的总分
服从正态分布
.
(1)求
;
(2)试估计该地区
名高三学生中,总分
落在区间
的人数.
参考数据:
,
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfce2106c9ad85e4965af5d95c9bf4d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80ce5cfa24ecb0d7b910fba2321b6d9a.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9863cb2dd63eb5f7f0f355df542821.png)
(2)试估计该地区
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfce2106c9ad85e4965af5d95c9bf4d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4a7c04dcb9ec7e952f924e4420d865a.png)
参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8f8641d4e8bbabc1e726417ac3c8cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee1c9871a68a9f90d1a27d3559aa974a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9546031173beb4c429883aae0e16e03b.png)
您最近一年使用:0次
2022-06-14更新
|
723次组卷
|
4卷引用:吉林省长春市长春吉大附中实验学校2021-2022学年高二下学期期中数学试题
吉林省长春市长春吉大附中实验学校2021-2022学年高二下学期期中数学试题(已下线)8.3 正态分布(练习)-2022-2023学年高二数学同步精品课堂(苏教版2019选择性必修第二册)海南省海口市农垦中学2023-2024学年高二下学期期中考试数学试题(已下线)第08讲 二项分布与超几何分布、正态分布 (高频考点,精讲)-2
名校
5 . 已知以原点为中心、公共焦点
、
在
轴上的椭圆与双曲线在第一象限内的交点为
,
,且二者的离心率满足
,
.在如图所示的正方形中随机投掷
个点,则落入阴影部分(曲线
为正态分布
的密度曲线)的点的个数的估计值为( )
(附:
,则
,
,
)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/7f0818dd-034b-4a62-9795-93da50f68ca7.png?resizew=180)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7affd8a277498fd39b4a2a95d649f45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ba5ba67e53c373bf8e5264df1e68afa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f0e3581ea46afd774719e3e6e04ab4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1926eb08a21a8b6558fcfd4c52a4a23b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fdaed76608a8234dd5b83ca884d9b5c.png)
(附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1290917c2c835b61384480b335cc1d13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e97705bedd45b860523d4fac71b64100.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/491c4b275f466e0ef3d15d61e471e34d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6244a790c4754e30eae020b4d9140037.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/7f0818dd-034b-4a62-9795-93da50f68ca7.png?resizew=180)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
6 . 某车间生产一批零件,现从中随机抽取10个零件,测量其内径的数据如下(单位:
):
87 87 88 92 95 97 98 99 103 104
设这10个数据的平均值为
,标准差为
.
(1)求
与
.
(2)假设这批零件的内径
(单位:
)服从正态分布
.
①从这批零件中随机抽取5个,设这5个零件中内径大于
的个数为
,求
;
②若该车间又新购一台新设备,安装调试后,试生产了5个零件,测量其内径分别为76,85,93,99,108(单位:
),以原设备生产性能为标准,试问这台设备是否需要进一步调试,说明你的理由.
参考数据:若
,则
,
,取
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
87 87 88 92 95 97 98 99 103 104
设这10个数据的平均值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c0ad7e7853a069537387b5192f73844.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c0ad7e7853a069537387b5192f73844.png)
(2)假设这批零件的内径
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8b9ad2fcfff3dd546c5fdbedfe6238.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29bcc248a7770a16fa10fc4602d71e0e.png)
①从这批零件中随机抽取5个,设这5个零件中内径大于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/807ce9f12e1c3c15a9c6abaa006a19da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bc6e5a19c85118036b94314df8da15f.png)
②若该车间又新购一台新设备,安装调试后,试生产了5个零件,测量其内径分别为76,85,93,99,108(单位:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
参考数据:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1290917c2c835b61384480b335cc1d13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e363c1a206c36ede46cee2236f5a5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d60b1d0c616eb9fefd1a022d455eb30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/279a7c5a0ee2e97f32b3f1a32d4b4b7a.png)
您最近一年使用:0次
2021-07-29更新
|
669次组卷
|
7卷引用:吉林省白城市2020-2021学年高二下学期期末数学理试题
吉林省白城市2020-2021学年高二下学期期末数学理试题人教A版(2019) 选修第三册 过关斩将 名优卷 第七章 章末综合测试卷2023版 湘教版(2019) 选修第二册 过关斩将 第3章 3.3正态分布(已下线)正态分布(已下线)第7章 随机变量及其分布(单元测试)-【上好课】2022-2023学年高二数学同步备课系列(人教A版2019选择性必修第三册)(已下线)7.5 正态分布 (精讲)(2)(已下线)7.5 正态分布(1)
7 . 若随机变量
,则
,
.已知随机变量
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d64b43f589ea10d8ad84d9df642b7265.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd48a80237dd53669f10ca4eda250519.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96c8a33d138253911acbab406c69ee68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5875021c75859442f01b584d3af4482.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3a33afeab184f00cf0964d88d990368.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d64b43f589ea10d8ad84d9df642b7265.png)
您最近一年使用:0次
2018-05-03更新
|
1203次组卷
|
4卷引用:吉林省延边第二中学2018-2019学年高二下学期期末数学(理)试题