单价x(元) | 8 | 8.2 | 8.4 | 8.6 | 8.8 | 9 |
销量y(件) | 90 | 84 | 83 | 80 | 75 | 68 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3617671ab9daae844ca0a46066fe7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3617671ab9daae844ca0a46066fe7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c85481cd7e94130ef3aa05b4a39e79cd.png)
(2)预计在今后的销售中,销量与单价仍然服从(1)中的关系,且该产品的成本是4元/件,为使工厂获得最大利润,该产品的单价应定为多少元?(利润=销售收入-成本)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![]() | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
![]() | 6 | 11 | 21 | 34 | 66 | 101 | 196 |
![](https://img.xkw.com/dksih/QBM/2020/9/25/2557559659208704/2557914965270528/STEM/5822a18f-9620-4816-adcc-d115d99719c1.png)
(1)根据散点图判断,在推广期内
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a5b1c19e4c57f1d259f8269e551c64.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)推广期结束后,车队对乘客的支付方式进行统计,结果如下表:
支付方式 | 现金 | 乘车卡 | 扫码 |
比例 | 10% | 60% | 30% |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e6486784415f3537c9a13556c05d893.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10b328845a4b1881eee38084d5501224.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
参考数据:其中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39ff66375b8e2c21f2695655cd804782.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f9d52f1d64804b2eb844a8c91a8867b.png)
参考公式:对于一组数据
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d5ba259eda554b5067243bb85eec269.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/25981f99d9f01b0845e8c5d5d03eea87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b194e2e65429c74167d24a7d687a039b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b83faa0e049032fbe6bd337273691657.png)
![]() | ![]() | ![]() | ![]() | ![]() |
66 | 1.54 | 2.711 | 50.12 | 3.47 |
3 . 某超市计划按月订购一种酸奶,每天进货量相同,进货成本每瓶4元,售价每瓶6元,未售出的酸奶降价处理,以每瓶2元的价格当天全部处理完.根据往年销售经验,每天需求量与当天最高气温(单位:℃)有关.如果最高气温不低于25,需求量为500瓶;如果最高气温位于区间[20,25),需求量为300瓶;如果最高气温低于20,需求量为200瓶.为了确定六月份的订购计划,统计了前三年六月份各天的最高气温数据,得下面的频数分布表:
最高气温 | [10,15) | [15,20) | [20,25) | [25,30) | [30,35) | [35,40) |
天数 | 2 | 16 | 36 | 25 | 7 | 4 |
以最高气温位于各区间的频率估计最高气温位于该区间的概率.
(1)求六月份这种酸奶一天的需求量不超过300瓶的概率;
(2)设六月份一天销售这种酸奶的利润为Y(单位:元),当六月份这种酸奶一天的进货量为450瓶时,写出Y的所有可能值,并估计Y大于零的概率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/254085ae2868cb0371a3844cac3fd14d.png)
最高 气温 | [10, 15) | [15, 20) | [20, 25) | [25, 30) | [30, 35) | [35, 40) |
天数 | 2 | 16 | 36 | 25 | 7 | 4 |
(1)求六月份这种酸奶一天的需求量X(单位:瓶)的分布列.
(2)设六月份一天销售这种酸奶的利润为Y(单位:元),当六月份这种酸奶一天的进货量n(单位:瓶)为多少时,Y的数学期望达到最大值?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf26ebae8eeef8a18dbd9667f5c3ca56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![](https://img.xkw.com/dksih/QBM/2018/7/10/1985665848557568/1987374068998144/STEM/a2d9dd74-2f90-4fc9-bbad-b346b752f31d.png?resizew=353)
(1)请判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/929ef3bed0a4bdd22f39e036506dc481.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c471e3de739c506f3146515826f8e551.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
(2)根据你的判断及下面的数据和公式,求出
![](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/39cc033406da2cdd342308972c6701f1.png)
参考公式及数据:线性回归方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/929ef3bed0a4bdd22f39e036506dc481.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e886bea25a1a8f1ebd1a74fca5d9a045.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35d35f886f6b590a2db330269ea9d939.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25b136d1d999440d98b75db764ec31f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9c94e3383859e5aad42616625ba24ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a531afc6e63700f1ca2b45d229efb9ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a376b2827cf12aec528f0a910ee2609f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
使用年数 | 2 | 3 | 4 | 5 | 6 | 7 |
售价 | 20 | 12 | 8 | 6.4 | 4.4 | 3 |
3.00 | 2.48 | 2.08 | 1.86 | 1.48 | 1.10 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)求
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abc5505526d11946ca7d3a4421a9e08f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d16a862478985191ece5a20bbe552bec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e2c4d12b3a705daab723ab243b6cc88.png)
(3)基于成本的考虑,该型号二手汽车的售价不得低于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15f73788367965d6f20cbc045650d967.png)
参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0ba68ff4f32e0960de18fa15633f362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ebff20f21ae41fd8d1f1e3145895842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfde935bd6aceaaa17ad42b16e6a5178.png)
参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4420ca6f4b8c4468e1efc79552bc914.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ba92f5c62296cb228ca8061f3168b2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e69437b4dd905d4c18d3c76cdbb3257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d964903e86b44e63137885d2252bd445.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73e943b4fb4e409aae2fdc28fbedc833.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fe1b1495add3d4aaeab5b46b7e25f1c.png)
![](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)
工种类别 | A | B | C |
赔付频率 | ![]() | ![]() | ![]() |
已知
![](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)
(1)求保险公司在该业务所获利润的期望值;
(2)现有如下两个方案供企业选择:
方案1:企业不与保险公司合作,职工不交保险,出意外企业自行拿出与保险公司提供的等额赔偿金赔偿付给出意外的职工,企业开展这项工作的固定支出为每年12万元;
方案2:企业与保险公司合作,企业负责职工保费的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/583f326b66bf3d3652bb1cabd96467b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d4ec5b9d2f5dbd6ec1cac34dbd8e547.png)
根据企业成本差异给出选择合适方案的建议.
出厂续驶里程R(公里) | 补贴(万元/辆) |
![]() | 3 |
![]() | 4 |
![]() | 4.5 |
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/b6463aac-03b7-4efe-b88c-bd251e73efac.png?resizew=286)
2019年底随机调查该市1000辆纯电动汽车,统计其出厂续驶里程R,得到频率分布直方图如上图所示用样本估计总体,频率估计概率,解决如下问题:
(1)求该市每辆纯电动汽车2019年地方财政补贴的均值;
(2)某企业统计2019年其充电站100天中各天充电车辆数,得如下的频数分布表:
辆数 | ![]() | ![]() | ![]() | ![]() |
天数 | 20 | 30 | 40 | 10 |
2020年3月,国家出台政策,将纯电动汽车财政补贴逐步转移到充电基础设施建设上来该企业拟将转移补贴资金用于添置新型充电设备,现有直流、交流两种充电桩可供购置.直流充电桩5万元/台,每台每天最多可以充电30辆车,每天维护费用500元/台;交流充电桩1万元/台,每台每天最多可以充电4辆车,每天维护费用80元/台.该企业现有两种购置方案:
方案一:购买100台直流充电桩和900台交流充电桩;
方案二:购买200台直流充电桩和400台交流充电桩.
假设车辆充电时优先使用新设备,且充电一辆车产生25元的收入,用2019年的统计数据,分别估计该企业在两种方案下新设备产生的最大日利润.(日利润
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bfc339cf6dd66599db64fa3fa44e608.png)
下周一 | 无雨 | 无雨 | 有雨 | 有雨 |
下周二 | 无雨 | 有雨 | 无雨 | 有雨 |
收益 | 20万元 | 15万元 | 10万元 | 7.5万元 |
(1)若不额外聘请工人,写出基地收益X的分布列及基地的预期收益;
(2)该基地是否应该外聘工人,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
(1)问该厂至少有多少名维修工人才能保证每台机器在任何时刻同时出现故障时能及时进行维修的概率不小于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28b4b06478c218a0e3421f8c52427c8b.png)
(2)已知1名工人每月只有维修1台机器的能力,每月需支付给每位工人1万元的工资,每台机器不出现故障或出现故障能及时维修,能使该厂产生5万元的利润,否则将不产生利润.若该厂现有2名工人,求该厂每月获利的均值.