![](https://img.xkw.com/dksih/QBM/2020/7/3/2498164025729024/2500078309285889/STEM/91478aff29aa4fd79d757ea3b4aabda4.png?resizew=469)
A.18 | B.50 | C.11 | D.17 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40a9d8c277a1345a5005408e5bebac41.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/392d0f5c-d446-4acc-b563-26c936a12038.png?resizew=307)
A.![]() | B.![]() | C.![]() | D.![]() |
【知识点】 频率分布直方图的实际应用解读
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/e7bbb7f5-9af1-4a01-a637-284facd9f7ce.png?resizew=140)
A.25.2 | B.24.6 | C.32.5 | D.44.6 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d33adb74906403b0b00fcbd9fa691d8b.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
【知识点】 利用对立事件的概率公式求概率
使用年限x(单位:年) | 2 | 3 | 4 | 5 | 6 |
维修总费用y(单位:万元) | 1 | ![]() | 3 | 4 | ![]() |
由上表可得线性回归方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6b8ea24574b846ecf645da323cb91c2.png)
A.![]() | B.![]() | C.![]() | D.![]() |
【知识点】 求回归直线方程解读 根据回归方程进行数据估计
①从15瓶饮料中抽取5瓶进行食品卫生检查.
②某校报告厅有25排,每排有38个座位,有一次报告会恰好坐满了学生,报告会结束后,为了听取意见,需要抽取25名学生进行座谈.
③某中学共有240名教职工,其中一般教师180名,行政人员24名,后勤人员36名.为了了解教职工对学校在校务公开方面的意见,拟抽取一个容量为20的样本.
较为合理的抽样方法是
A.①简单随机抽样,②系统抽样,③分层抽样 | B.①简单随机抽样,②分层抽样,③系统抽样 |
C.①系统抽样,②简单随机抽样,③分层抽样 | D.①分层抽样,②系统抽样,③简单随机抽样 |
![](https://img.xkw.com/dksih/QBM/2020/5/7/2457820424019968/2459262428086272/STEM/c3d63be9-c2de-499a-994e-624c744f3033.png?resizew=470)
A.241 | B.242 | C.243 | D.244 |
【知识点】 读懂条件结构框图的功能 读懂循环结构框图的功能
![](https://img.xkw.com/dksih/QBM/2013/7/17/1571285100347392/1571285105729536/STEM/193cda73-a72e-4b3c-88cb-52655930e578.png)
A.1 | B.![]() | C.![]() | D.![]() |
【知识点】 根据循环结构框图计算输出结果
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/10/7c8e10d2-f41b-4615-917a-dfc082f64439.png?resizew=269)
A.35 | B.33.6 | C.31.3 | D.28.3 |
【知识点】 由频率分布直方图估计中位数解读
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/d5538ed4-2db4-4215-b499-cab883584041.png?resizew=165)
A.![]() | B.![]() | C.![]() | D.![]() |
【知识点】 计算古典概型问题的概率
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5726a9efc9b1c5a4bd95a6582583fa06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7054b4cdb50f283d6db90ab1a7ad877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b844647aab6ef758352dd0a6794bfaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf0a57f7f19bd5919e98bf0414fe850.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c780149aef1bd77162e85f7f8906a6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6016e74e98c5072983af42e403465e5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fe9f3099ed9429dc5b4e38a350e524a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9424e9c40bcd1db74fd65f092b57c2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96ef46875714d85dd43abca0bd4fe1f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7fac2c1aab61d5d6b6d1ebacf76df4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b11c238699806917f182e2f5c40219f0.png)
A.![]() | B.![]() | C.![]() | D.![]() |
【知识点】 函数周期性的应用 由标准方程确定圆心和半径 几何概型-面积型解读
A.“甲站排头”与“乙站排头” | B.“甲站排头”与“乙不站排尾” |
C.“甲站排头”与“乙站排尾” | D.“甲不站排头”与“乙不站排尾” |
【知识点】 互斥事件与对立事件关系的辨析解读
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/6b2fb2c6-af34-40d3-8133-dcd93f110353.png?resizew=169)
A.“不支持”部分所占的比例大约是整体的![]() |
B.“一般”部分所占的人数估计是800人; |
C.饼图中如果圆的半径为2,则“非常支持”部分扇形的面积是![]() |
D.“支持”部分所占的人数估计是1100人 |
【知识点】 总体与样本解读 根据扇形统计图解决实际问题解读
![](https://img.xkw.com/dksih/QBM/2020/8/5/2521506784370688/2522185099206656/STEM/65b9d9f16d0a4dc6a0bd5298b719fd76.png?resizew=554)
对比健身前后,关于这20名肥胖者,下面结论不正确的是( )
A.他们健身后,体重在区间![]() |
B.他们健身后,体重在区间![]() |
C.因为体重在![]() |
D.他们健身后,原来体重在区间![]() |
【知识点】 根据条形统计图解决实际问题解读
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/e7ee726a-6528-4a14-a55e-dd404bb30116.png?resizew=279)
A.前六天一直保持上升趋势 | B.相邻两天的差最大为3 |
C.众数为0 | D.最大值与最小值的差为7 |
【知识点】 根据折线统计图解决实际问题解读
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a5a2b7739dd7663a53144b6ebba9645.png)
【知识点】 计算古典概型问题的概率 有放回与无放回问题的概率
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b668dfe312af716e3e8240cdb07e9aab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54770d47768527dee6ca1e29e955e5bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/005620e193fa696684fdf5803c16ae66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/2016/5/26/1572651334828032/1572651341004800/STEM/4a549059-670f-42cb-ad02-7ca1673c417b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a150f137269d0d6e67875b1ee0dca76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21cfe0a7a9aa342da0097085a521c16b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07a1718c50d882bc5bd1e6de97730e15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91bde66645c9abf9e847ea67854c14a6.png)
![](https://img.xkw.com/dksih/QBM/2018/11/13/2074685664264192/2076112444071936/STEM/f7aa1ea698d34ad490dacb9f9aa26e21.png?resizew=154)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://img.xkw.com/dksih/QBM/2018/4/28/1934056407719936/1936110024957952/STEM/c48858790b344924962a2abe0c11872e.png?resizew=151)
(1)请在图中处理框内①处和判断框中的②处填上合适的语句,使之能完成该题算法功能;
(2)根据算法框图写出算法语句.
【知识点】 读懂循环结构框图的功能 补全循环结构的框图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d974386413fa19f33907946d5506af4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cfc1d8b3ceb5ee8e3b0a659539b43ae.png)
![](https://img.xkw.com/dksih/QBM/2018/6/2/1958489639796736/2020752780468224/STEM/bbde408f620b4eb38cb021287cdbace2.png?resizew=350)
(Ⅰ)请估计该公司的职工月收入在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbf36e3e2284192e759c3259f33f464a.png)
(Ⅱ)根据频率分布直方图估计样本数据的中位数和平均数.
(1)求该班全体男生的人数;
(2)求分数在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194847dcb4b17470cfb193156943c1ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194847dcb4b17470cfb193156943c1ae.png)
(3)根据频率分布直方图,估计该班全体男生的数学平均成绩(同一组中的数据用该组区间的中点值代表).
![](https://img.xkw.com/dksih/QBM/2017/5/3/1679119478882304/1739122411216896/STEM/085ca0faeff7432d8e988ad42721817e.png?resizew=443)
甲:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a68f4a758497dc2d806410d02c48cb97.png)
乙:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f315b4821e7f6d1a19ec26f716b6d312.png)
(1)根据抽测结果,完成答题卷中的茎叶图,并根据你填写的茎叶图,对甲、乙两种树苗的高度作比较,写出两个统计结论;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c85481cd7e94130ef3aa05b4a39e79cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
广告支出![]() | 1 | 2 | 3 | 4 |
销售收入![]() | 12 | 28 | 42 | 56 |
(2)求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)若广告费为9万元,则销售收入约为多少万元?
【知识点】 绘制散点图 求回归直线方程解读 根据回归方程进行数据估计
![](https://img.xkw.com/dksih/QBM/2017/1/17/1619458715213824/1619458715705344/STEM/a318c99ca5f142be8bf65e58e0114788.png?resizew=247)
![](https://img.xkw.com/dksih/QBM/2017/1/17/1619458715213824/1619458715705344/STEM/9c9ff15d14ba4d4fa09665a3f7d03f4f.png?resizew=350)
(1)求频率分布直方图中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d701d16d9f318ee8fa779f5b961d64c.png)
(2)从该小区随机选取一个家庭,试估计这个家庭去年的月均用水量不低于6吨的概率;
(3)在这40个家庭中,用分层抽样的方法从月均用水量不低于6吨的家庭里抽取一个容量为7的样本,将该样本看成一个总体,从中任意选取2个家庭,求其中恰有一个家庭的月均用水量不低于8吨的概率.
某支足球队的主教练打算从预备球员甲、乙两人中选一人为正式球员,他收集到了甲、乙两名球员近期5场比赛的传球成功次数,如下表:
场次 | 第一场 | 第二场 | 第三场 | 第四场 | 第五场 |
甲 | 28 | 33 | 36 | 38 | 45 |
乙 | 39 | 31 | 43 | 39 | 33 |
![](https://img.xkw.com/dksih/QBM/2020/5/31/2474471508590592/2476754500599808/STEM/c8ef4defd2954e348b408c373d3938cf.png?resizew=352)
(1)根据这两名球员近期5场比赛的传球成功次数,完成茎叶图(茎表示十位,叶表示个位);分别在平面直角坐标系中画出两名球员的传球成功次数的散点图;
(2)求出甲、乙两名球员近期5场比赛的传球成功次数的平均值和方差;
(3)主教练根据球员每场比赛的传球成功次数分析出球员在场上的积极程度和技术水平,同时根据多场比赛的数据也可以分析出球员的状态和潜力.你认为主教练应选哪位球员?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/885d73d67ae70cb0d7359974b2e5c931.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/885d73d67ae70cb0d7359974b2e5c931.png)
(Ⅰ)若某日的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/885d73d67ae70cb0d7359974b2e5c931.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/885d73d67ae70cb0d7359974b2e5c931.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/885d73d67ae70cb0d7359974b2e5c931.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/885d73d67ae70cb0d7359974b2e5c931.png)
(Ⅱ)如图是2017年11月的30天的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/885d73d67ae70cb0d7359974b2e5c931.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38a0376534a48a42fbb209dcc69a8cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/885d73d67ae70cb0d7359974b2e5c931.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a99a5491cc87b6f44f127110724d45a9.png)
①求11月的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/885d73d67ae70cb0d7359974b2e5c931.png)
②双创活动中,验收小组要从中度污染区和重度污染区中按比例抽取六个监测点,然后从这六个监测点中随机抽取3个对监测数据进行核实,求至少抽到一个重度污染区的概率.
![](https://img.xkw.com/dksih/QBM/2018/4/23/1930340892852224/1931957215789056/STEM/51c4e445-32ea-4f5c-863c-7da133452e03.png?resizew=377)
【知识点】 频率分布直方图的实际应用解读
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f71651cc907332426f70e0ef54e5512.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9c214cc074cf24aa90f2dfb01de102a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/d30e2ed8-8c14-4543-864c-fbcb7beec5af.png?resizew=235)
(Ⅰ)按分层抽样的方法从单果直径落在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6178f0c2f2fdfd7a0219f1d9b392cad0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a84e864379bbb169336c7c69aa23475.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6178f0c2f2fdfd7a0219f1d9b392cad0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a84e864379bbb169336c7c69aa23475.png)
(Ⅱ)从(Ⅰ)中选出的6个苹果中随机抽取2个,求这两个苹果单果直径均在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a84e864379bbb169336c7c69aa23475.png)
(Ⅲ)以此茎叶图中单果直径出现的频率代表概率,若该合作农场的果园有20万个苹果约5万千克待出售,某电商提出两种收购方案:方案
![](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/9e8e1610312ac94d9d84b3dd35f03bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/251c1f244f0e87571637fa464162d70f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6d34293c6a5123b87d565c1b816f695.png)
【知识点】 观察茎叶图比较数据的特征解读 计算古典概型问题的概率
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
(1)求甲乙恰有一人中奖的概率;
(2)若甲计划在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bbdd87d3c0b744fda4a5d384decace0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d35d18052d7aaeaccd38c8fa69dc35c4.png)
【知识点】 计算古典概型问题的概率 几何概型-面积型解读