![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97ea8f47d8d8d9e1832d52b1c7425450.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4de122ae929b1acaff321dec137622ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28927ff0dd8ffb94fe99863fedc255c0.png)
![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
2017.5 | 80.4 | 1.5 | 40703145.0 | 1621254.2 | 27.7 | 1226.8 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc51189c4268a8eaf04a24696ac415eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f5024a1a47b50c81a1d6a5e926d3f2d.png)
(1)根据散点图判断,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33b447ac3d1a965572c31b6e4c18d4b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0067cc8ea9c27a7c45b835bd231de11c.png)
(2)已知2023年该机场飞往A地、B地和其他地区的航班比例分别为0.2、0.2和0.6.若以(1)中的预测值作为2023年该机场飞往A地航班放行准点率的估计值,且2023年该机场飞往B地及其他地区(不包含A、B两地)航班放行准点率的估计值分别为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbb00d558e456638de8ff1788db5a8d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e76496989a451b5e945e3043f4af5ad.png)
(i)现从2023年在该机场起飞的航班中随机抽取一个,求该航班准点放行的概率;
(ii)若2023年某航班在该机场准点放行,判断该航班飞往A地、B地、其他地区等三种情况中的哪种情况的可能性最大,说明你的理由.
附:(1)对于一组数据
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1c6aadc0129bf86f4fff9dcfb924b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/154100371e025fffe0ffae8be9567383.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a14e40329de36fc4a1a3f8fbfafda12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0943f70585435955d528325e51ef013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e29eaeed7261f564ae82dfeceef85deb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/815e2869dc16e2ae7a7e1911e3afc8c3.png)
参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6634323a463191194dd14c3a9cbc7a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38c6dbc06493f4d4614990e7822a5343.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23a404c71f17b741494e7ff25e8da9db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97ea8f47d8d8d9e1832d52b1c7425450.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4de122ae929b1acaff321dec137622ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c45176df950dfe48b8ca7eac08ee349.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://img.xkw.com/dksih/QBM/2023/5/25/3245239723835392/3245611519713280/STEM/9b514db9b68f4bd89ee8f52fc4c1c9f7.png?resizew=315)
(1)根据散点图判断,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33b447ac3d1a965572c31b6e4c18d4b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0067cc8ea9c27a7c45b835bd231de11c.png)
(2)已知2023年该机场飞往A地、B地和其他地区的航班比例分别为0.2、0.2和0.6.若以(1)中的预测值作为2023年该机场飞往A地航班放行准点率的估计值,且2023年该机场飞往B地及其他地区(不包含A、B两地)航班放行准点率的估计值分别为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbb00d558e456638de8ff1788db5a8d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e76496989a451b5e945e3043f4af5ad.png)
2017.5 | 80.4 | 1.5 | 40703145.0 | 1621254.2 | 27.7 | 1226.8 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc51189c4268a8eaf04a24696ac415eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f5024a1a47b50c81a1d6a5e926d3f2d.png)
附:其回归直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce3a7d89965c094792f87594bd68afd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2dbdbf02e0dd324daba7488c3e3bf31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a58291bd91befe1061530246da983727.png)
参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6634323a463191194dd14c3a9cbc7a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38c6dbc06493f4d4614990e7822a5343.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23a404c71f17b741494e7ff25e8da9db.png)
(1)设事件A:“两道谜语中小明恰好答对一道”,求事件A发生的概率P(A).;
(2)如果按照如下规则猜谜:只有在猜对一道谜语的情况下,才有资格猜下一道.
①若猜谜语顺序由小明选择,小明应该先猜哪一道呢?
②若小明已经获得30元奖金,此时主办方临时增加了一道终极谜语C,猜对奖金为60元,参赛者可以自行选择是否继续猜谜.假设小明猜对C谜语的概率为a,若小明不继续,可以直接拿走奖金,若继续且答错C谜语,则没收全部奖金.若继续且答对C谜语,即可获得A谜语、B谜语和C谜语的所有奖金.问:概率a至少为何值,值得小明同学继续猜谜?
方式一:将班级选派的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d51f9147b8265c0276c1f2c2659197.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
方式二:将班级选派的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d51f9147b8265c0276c1f2c2659197.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(1)甲同学参加个人晋级赛,他答对前三题的概率均为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
(2)在团体对决赛中,假设某班每位参赛同学对给出的试题回答正确的概率均为常数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44fed1be8b7e50f18cb90077d9fce8e4.png)
5 . 某纺织厂为了生产一种高端布料,准备从A农场购进一批优质棉花,厂方技术员从A农场存储的优质棉花中随机抽取了100处棉花,分别测量了其纤维长度(单位:mm)的均值,收集到100个样本数据,并制成如下频数分布表:
长度(单位:mm) | [23,25) | [25,27) | [27,29) | [29,31) | [31,33) | [33,35) | [35,37) | [37,39] |
频数 | 4 | 9 | 16 | 24 | 18 | 14 | 10 | 5 |
(1)求这100个样本数据的平均数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c85481cd7e94130ef3aa05b4a39e79cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/671f43c79d612c93a6d160335e86e177.png)
(2)将收集到的数据绘成直方图可以认为这批棉花的纤维长度服从分布
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1290917c2c835b61384480b335cc1d13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/594f4ea0d5f4a741355161af9eb34104.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48d1316cf501a47b6d75594091d5f4a4.png)
①利用正态分布,求;
②纺织厂将A农场送来的这批优质棉进行二次检验,从中随机抽取20处测量其纤维均值yi(i=1,2…,20),数据如下:
y1 | y2 | y3 | y4 | y5 | y6 | y7 | y8 | y9 | y10 |
24.1 | 31.8 | 32.7 | 28.2 | 28.4 | 34.3 | 29.1 | 34.8 | 37.2 | 30.8 |
y11 | y12 | y13 | y14 | y15 | y16 | y17 | y18 | y19 | y20 |
30.6 | 25.2 | 32.9 | 27.1 | 35.9 | 28.9 | 33.9 | 29.5 | 35.0 | 29.9 |
若20个样本中纤维均值的频率不低于①中
即可判断该批优质棉花合格,否则认为农场运送时掺杂了次品,判断该批棉花不合格.按照此依据判断A农场送来的这批棉花是否为合格的优质棉花,并说明理由.
附:若,则
,
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33b447ac3d1a965572c31b6e4c18d4b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46d5d836cacd4fd16a4919a91e9efaba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ae463200d075fcec1738869a38b992e.png)
(2)由(1)的判断结果及表中数据,求出y关于x的回归方程.(计算结果精确到0.1)
附:回归方程中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/929ef3bed0a4bdd22f39e036506dc481.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ac81db4d6a73ba8994c2a5a2c5f56b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cec5f29cac1f0340ecae12821bcf7e36.png)
参考数据( | |||||
5215 | 17713 | 714 | 27 | 81.3 | 3.6 |
在每年价格不变,无虫害的情况下,某果园年产值为200万元,根据以上数据,以得到最高收益(收益=产值-防害费用)为目标,请为果农从以下几个方案中推荐最佳防害方案,并说明理由.
方案1:选择防害措施A,可以防止各种气温的红蜘蛛虫害不减产,费用是18万;
方案2:选择防害措施B,可以防治22℃至28℃的蜘蛛虫害,但无法防治28℃以上的红蜘蛛虫害,费用是10万;
方案3:不采取防虫害措施.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/18/ff38ec11-9220-43ce-aa68-a4a4f5bb2c5c.png?resizew=281)
(1)如图1所示的高尔顿板有5层小木块,小球从通道口落下,第一次与第2层中间的小木块儿碰撞,等可能向左或向右滚下,依次经过4次与小木块儿碰撞,最后掉入编号为1,2,3,4,5的球槽里. 现在进行一次高尔顿板实验,求小球落入3号球槽的概率;
(2)在学校组织的爱心义卖活动中,李明和王华利用高尔顿板进行盈利型“爱心抽奖”,进行一次高尔顿板实验,就是参加了一次抽奖.
①李明用如图1所示高尔顿板,同学们每付费5元即可抽奖一次. 小球落入第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d24bce7268e322eb8cdc302c5504dcf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
②王华用如图2所示的高尔顿板,同学们每付费5.5元即可抽奖一次. 小球落入第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c1116ce7f5a1a7b57517276d5092fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9054a6e54509fa07ad734ca762c6bd97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49e60fbe6820130fb20abc555a94b5ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b837fd9c52f60bfb3b6852733abc790.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b06e95b57b7a81cd81d05557a11fa92.png)
(1)如果按照性别比例分层抽样,可以得到多少个不同的样本?(写出算式即可,不必计算出结果)
(2)如果随机抽取的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b06e95b57b7a81cd81d05557a11fa92.png)
学生序号i | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
数学成绩![]() | 60 | 65 | 70 | 75 | 85 | 87 | 90 |
物理成绩![]() | 70 | 77 | 80 | 85 | 90 | 86 | 93 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83fd1dadbe1b2cafc0cf8b5bb8b18ed9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83fd1dadbe1b2cafc0cf8b5bb8b18ed9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b06e95b57b7a81cd81d05557a11fa92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
(ii)根据上表数据,求物理成绩
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e2c4d12b3a705daab723ab243b6cc88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15e398a06d8ffa9071cf32c3e9e73a1.png)
附:线性回归方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bcecfbd0e0b460f4e4ff6f654bd4608.png)
其中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/107940b2542bfbcaeec00bfb9b666e0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65b7e3d39b476f8438b103ede00bf61a.png)
![]() | ![]() | ![]() | ![]() |
76 | 83 | 812 | 526 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
1 | 2 | 3 | 4 | 5 | 6 | 7 | |
6 | 11 | 21 | 34 | 66 | 101 | 196 |
![](https://img.xkw.com/dksih/QBM/2020/7/23/2512194899066880/2512282700079104/STEM/9f1f9819-5674-4455-8556-a8017badb3ae.png?resizew=244)
观察散点图,两个变量不具有线性相关关系,现考虑用对数函数模型
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d67cb2e70b94da2d7d63193b85b67b08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a3edbe89f552dd6cfd1abd462eef371.png)
(1)根据散点图判断,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d67cb2e70b94da2d7d63193b85b67b08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a3edbe89f552dd6cfd1abd462eef371.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)根据(1)的判断结果及表1中的数据,建立
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)已知每件产品的原料成本为10元,若该产品的总成本不得高于123470元,请估计最多能生产多少千件产品.
参考数据:
62.14 | 1.54 | 2535 | 50.12 | 3.47 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39ff66375b8e2c21f2695655cd804782.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3ce38a38bc80c9197c1b00b84c8743e.png)
参考公式:对于一组数据
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1c6aadc0129bf86f4fff9dcfb924b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/154100371e025fffe0ffae8be9567383.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a14e40329de36fc4a1a3f8fbfafda12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f27e98f5555089692253c0c3f2ec0d92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74f38451023eaad524140b4ba939c375.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10a21112ac5c089fb55fb5f3e2a0e8f7.png)
年份 | 2018 | 2019 | 2020 | 2021 | 2022 |
编号x | 1 | 2 | 3 | 4 | 5 |
企业总数量y(单位:千个) | 2.156 | 3.727 | 8.305 | 24.279 | 36.224 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a5b1c19e4c57f1d259f8269e551c64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf4057e429061267ca284cf0882fbaf2.png)
(2)根据(1)的结果,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
附:线性回归方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1db6103cb0f1d2bd6b19235d53ee7e98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833b0fa3122756d3cbeef4b8d1d156cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a58291bd91befe1061530246da983727.png)
参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42ada85497d843df7509c5b601e8cf6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c053a3c804e98a68b732704304b1440.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d00d0a8af3772f6be4991b58b09d4632.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c2e5cb74992160976bdd53bbe41818b.png)
(3)为了促进公司间的合作与发展,区块链联合总部决定进行一次信息化技术比赛,邀请甲、乙、丙三家区块链公司参赛,比赛规则如下:①每场比赛有两个公司参加,并决出胜负;②每场比赛获胜的公司与未参加此场比赛的公司进行下一场的比赛;③在比赛中,若有一个公司首先获胜两场,则本次比赛结束,该公司就获得此次信息化比赛的“优胜公司”.已知在每场比赛中,甲胜乙的概率为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac97e6740365c85ad857aff85cefbe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)