单价 | 8 | 8.2 | 8.4 | 8.6 | 8.8 | 9 |
销量 | 90 | 84 | 83 | 80 | 75 | 68 |
![](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/929ef3bed0a4bdd22f39e036506dc481.png)
(2)若单价定为10元,估计销量为多少件;
(3)根据销量
![](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/dad2a36927223bd70f426ba06aea4b45.png)
参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86e9987aaf460d0fb5aa37b025c0ecd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ebff20f21ae41fd8d1f1e3145895842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f056527b4168f469da2eaa5f0ae20da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/528c0cc3c50f4f265a2688042361baea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e03eebbe6a33abc1830ce6b7e8b74bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89e593828316139a54019e352dec883f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9966dfe9109671c587892bd32f0b6699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bdcc2013cf4d1f3eaebe6dbe12e59b3.png)
(1)将利润
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)当产量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
单价![]() | 18 | 19 | 20 | 21 | 22 |
销量![]() | 61 | 56 | 50 | 48 | 45 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)预计今后的销售中,销量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0454906e2407cd3e0829b1bc304f389e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a58291bd91befe1061530246da983727.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adefa59ed47e5d852547aa7dafde765.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/978e2cab323698212d00a16aa39eb562.png)
![](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/cfa1c68c4a58a9355729b470ccc16c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bfc339cf6dd66599db64fa3fa44e608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
(1)试用销售单价
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
(2)试问销售单价定为多少时,该商店可获得最大利润?最大利润是多少?此时的销售量是多少?
销售单价x(元) | 60 | 62 | 64 | 66 | 68 | … |
销售量y(件) | 600 | 580 | 560 | 540 | 520 | … |
(1)建立一个恰当的函数模型,使它能较好地反映销售量y(件)与销售单价x(元)之间的函数关系,并写出这个函数模型的解析式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
(2)试求销售利润z(元)与销售单价x(元)之间的函数关系式(销售利润 = 总销售收入-总进价成本);
(3)在(1)(2)条件下,当销售单价为多少元时,能获得最大利润?并求出此最大利润.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4ecdba1e93488d2cdf4a7419ff999a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/065cef75020ec904da15f257e88ac188.png)
(1)将利润表示为月产量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)当月产量为何值时,公司所获利润最大?最大利润为多少元?
7 . 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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
(1)写出
![](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/91acf7de7ee249e6b72ee91a399eea04.png)
(2)当公司参加培训的员工为多少人时,培训机构可获得最大利润?并求最大利润.
![](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/b9c214cc074cf24aa90f2dfb01de102a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3dac5b023be85dcb00653ccd2eca13f.png)
(1)一顾客购买了20个该果园的“糖心苹果”,求会买到果径小于56
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9c214cc074cf24aa90f2dfb01de102a.png)
(2)为了提高利润,该果园每年投入一定的资金,对种植、采摘、包装、宣传等环节进行改进.如图是2009年至2018年,该果园每年的投资金额
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/0aa58fca-9433-4abd-8983-138462093357.png?resizew=274)
该果园为了预测2019年投资金额为20万元时的年利润增量,建立了
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
模型①:由最小二乘公式可求得
![](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/6a1d7987a5a81dcf97e0c6f9b73c0605.png)
模型②:由图中样本点的分布,可以认为样本点集中在曲线:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb0027a0822fb984dc68429182c49b72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7ae9d60c249c43595f349d5a092f63f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6970f0219fc7100665928d5f6276de04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b451952d620114e3d55afa4089e3ecc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2e5d1c33f57f4128b284b9e75f9d698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91bb20dfa498ca6f38e7ac30ac17e21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0451386b105094c7a459f8babf3bbad5.png)
(I)根据所给的统计量,求模型②中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(II)根据下列表格中的数据,比较两种模型的相关指数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c85067c53e936ef32da818efe04bdbb.png)
回归模型 | 模型① | 模型② |
回归方程 | ![]() | ![]() |
![]() | 102.28 | 36.19 |
附:若随机变量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08efacb7ec7069dafde79d6e13d0fdc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89215ea24f10b24d7ea83ae6d1f89184.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/467cf09764d3548ed791fdee25075959.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/226d2b52caa031a2fa9db35ad1f552a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b33d9063c19ee881cb6be51fe6b83766.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa16fa102e7d1186183a93447575199.png)
相关指数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eddbd6ca2ea4ab97dd634ac17c653098.png)
参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c895bb4bf49ee9b0023e63444bf06a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8941d8b8279d833fb53c58bb838dbf5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0591d9f78b4f4f78c5bd6baaa602ae0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3616e69114889d5d02099b6598a57136.png)