1 . 为了研究y关于x的线性相关关系,收集了5对样本数据(见表格),若已求得一元线性回归方程为
,则下列选项中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8498919ac0cc8a16477beaafec83c10d.png)
![]() | 1 | 2 | 3 | 4 | 5 |
![]() | ![]() | ![]() | 1 | ![]() | ![]() |
A.![]() |
B.当![]() ![]() |
C.样本数据y的40百分位数为1 |
D.去掉样本点![]() |
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解题方法
2 . 设
,若
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/582066df000f70b6b4fa5ab11e931bdb.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afc0fee842afa40cbb8674fa8eb9edac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/553a2b13547ab9fabd8878fbbb8780db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb8e7a2df4185211339d84892de2ddf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/582066df000f70b6b4fa5ab11e931bdb.png)
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3 . 甲、乙、丙等5人站成一排,甲乙相邻,且乙丙不相邻, 则不同排法共有( )
A.24 种 | B.36 种 | C.48 种 | D.72 种 |
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4 . 现要安排6名大四学生(其中4名男生、2名女生)到
,
,
三所学校实习,每所学校2人,若男生甲不安排到
学校,2名女生必须安排到不同的学校且不安排到
学校,则不同的安排方法共有______ 种.(用数字作答)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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5 . 若随机变量
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b58d8c1e5bef3ef13bdec5143e446dc.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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6 . 已知
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9c73c387924cc8d8ff2af8e4ada7ee0.png)
________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ab1b295c3cdbf2ae155e5996d2c9a15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9c73c387924cc8d8ff2af8e4ada7ee0.png)
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7 . 记
“
的不同正因数的个数”,
“
的展开式中
项的系数”,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9163ebe812708ee5337d62298c2e3363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e74c6091504af98fdf10ef560ecef1fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17f7ab83c2c0bbcaabc2a177855d55d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d74b0b6308dfbefc2ab456e53e108aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84e49e85c53ef44877c6cd124243fa9c.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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名校
8 . 一个车间有3台机床,它们各自独立工作,其中
型机床2台,
型机床1台.
型机床每天发生故障的概率为0.1,B型机床每天发生故障的概率为0.2.
(1)记X为每天发生故障的机床数,求
的分布列及期望
;
(2)规定:若某一天有2台或2台以上的机床发生故障,则这一天车间停工进行检修.求某一天在车间停工的条件下,B型机床发生故障的概率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(1)记X为每天发生故障的机床数,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc79c66ebaacd709ec9965b90a22b14.png)
(2)规定:若某一天有2台或2台以上的机床发生故障,则这一天车间停工进行检修.求某一天在车间停工的条件下,B型机床发生故障的概率.
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9 . 若
的展开式中存在常数项,则
的值可以是______ (写出一个值即可)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/563715792ead6a27d626663439178ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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2024-06-15更新
|
98次组卷
|
2卷引用:江苏省泰州市2024届高三下学期四模数学试题
10 . 假定射手甲每次射击命中目标的概率为
其中
.
(1)当
时,若甲射击
次,命中目标的次数为
.
①求
;
②若
其中
求
的值.
(2)射击积分规则如下:单次未命中目标得
分,单次命中目标得
分,若连续命中目标
次,则其中第一次命中目标得1分,后一次命中目标的得分为前一次得分的2倍.记射手甲射击4次的总得分为
,若对任意
有
成立,求所有满足上述条件的有序实数对
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aac95e741a0cda29e2e907e4f114d2e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20c11f6c800b8e0410674a0c6d307d26.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e74b0aa7a6f6dcab7d9101b98504ae2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bf3baba074e8aeb6f3ea117865bbd1b.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02af71919e09c05e34b95ba014bf07ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f594e2141ce84a0b5d36f50b66b7e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(2)射击积分规则如下:单次未命中目标得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/841f8c6051dff35b6f44c89ff3117267.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a829fdd8ec0f3b7ede883cf2c3e53b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ca1e2f8e87b1b90a214cd6aad99cb7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb4d5ca4e251ff0e503a26f9a7375326.png)
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