![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b06e95b57b7a81cd81d05557a11fa92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b3779b4ea5477aebfe85113b0de1d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
授课量(单位:小时) | |||||
频数 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b3779b4ea5477aebfe85113b0de1d60.png)
课时量(单位:天) | |||||
频数 |
(1)估计
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
(2)若以(1)中确定的平均数作为上述一天的授课量.已知当地授课价为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90dd550e1ad9bbf01687ffb4aab788ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1f959e5f8d89390f0f136f6acc9f6fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b3779b4ea5477aebfe85113b0de1d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/811ddb62dded70f279710ae6c0fdbb80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/591c5b712dc14517e369be2345526fc7.png)
手机店 | ![]() | ![]() | ![]() | ![]() | ![]() |
![]() | 6 | 6 | 13 | 8 | 11 |
![]() | 12 | 9 | 13 | 6 | 4 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4489d9b83072184c0e1d6b09be50ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1e8babee63bfc889ae5a34632284bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/811ddb62dded70f279710ae6c0fdbb80.png)
(Ⅱ)现从这5个手机店中任选3个举行促销活动,用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/674e31dbbc3c338972a2fa85d588afae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/811ddb62dded70f279710ae6c0fdbb80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/591c5b712dc14517e369be2345526fc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/674e31dbbc3c338972a2fa85d588afae.png)
(III)经测算,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/811ddb62dded70f279710ae6c0fdbb80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c1116ce7f5a1a7b57517276d5092fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5e015a6184ac23b55c0592a34bf79bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/811ddb62dded70f279710ae6c0fdbb80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aac9a568667c7dff9df9a5017f663a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/811ddb62dded70f279710ae6c0fdbb80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d12a7d34b2f188608b42f339f91fec6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/ec13128e-bd6c-49f0-b6f8-97f48e50aa19.png?resizew=188)
A.![]() | B.![]() | C.![]() | D.![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895b9f3df5efc5da06b61a94c1ecd7c7.png)
最高气温 | [10,15) | [15,20) | [20,25) | [25,30) | [30,35) | [35,40) |
天数 | 1 | 17 | 38 | 22 | 7 | 5 |
(1)估计六月份这种酸奶一天的需求量不超过400瓶的概率,并求出前三年六月份这种酸奶每天平均的需求量;
(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550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/dde7ecce8a793b8a5f25fc1651207b83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/457924045b24213c5fa1f579ef16e28f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15d0496447afe099475afdf1eaadd6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77077d791bacdf7783bbcd41090c1ab5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dadc63e6e33743ce590ed968948a5a58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://img.xkw.com/dksih/QBM/2020/3/29/2429944428306432/2430240954957825/STEM/6822960ab8c948c1b7fc53df694a59ac.png?resizew=419)
(1)分别估计在昼、夜两个批次的产品中随机抽取一件产品为合格品的概率;
(2)以上述样本的频率作为概率,求这台车床一天的总利润的平均值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
序号i | 1 | 2 | 3 | 4 | 5 |
项目投资额 | 30 | 40 | 50 | 60 | 70 |
产品利润 | 90 | 120 | 180 | 260 | 310 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed4b854003241761ae42afeef995d12c.png)
![](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/b0cd72e800a924d4579dde22f84c3c99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56729bd5cfde71dd6d04780792a70b58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a16405557a98378fe99a9a3b454fd8f.png)
50 | 192 | 2700 | 10140000 | 586000 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb45536a6e4c98ac194825acab9ff0fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0580b48b1e81b38e07565992242e9b8.png)
(2)该扶贫项目用于支付工人劳动所得资金总额
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/595044a7750ab4f84519041979c3d780.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34b8b05d52d470008e7d42805c334ce0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074774928338faf6ffc1731719aac878.png)
年利润 | 1.2万元 | 1.0万元 | 0.9万元 |
频数 | 20 | 60 | 40 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
合格次数 | 2 | 1 | 0 |
年利润 | 1.3万元 | 1.1万元 | 0.6万元 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a829fdd8ec0f3b7ede883cf2c3e53b.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae370cd09065372355be1ba7b78e6423.png)
(2)某商人打算对甲或乙项目投资十万元,判断哪个项目更具有投资价值,并说明理由.
8 . 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)
月份 | 1 | 2 | 3 | 4 | 5 |
销售量 | 3 | 6 | 4 | 7 | 8 |
利润 | 19 | 34 | 26 | 41 | 46 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)已知销售量x与利润y近似满足线性关系,请根据表中前4个月的数据,求出y关于x的线性回归方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d602102328dd1c20afa2d0c7ecc6cd1.png)
(3)若由线性回归方程得到的利润的估计数据与真实数据的误差不超过2万元,则认为得到的利润的估计数据是理想的.请用表格中第5个月的数据检验由(2)中回归方程所得的第5个月的利润的估计数据是否理想.
机器类型 | 第一类 | 第二类 | 第三类 | 第四类 | 第五类 |
销售总额(万元) | ![]() | ![]() | ![]() | ![]() | ![]() |
销售量(台) | ![]() | ![]() | ![]() | ![]() | ![]() |
利润率 | ![]() | ![]() | ![]() | ![]() | ![]() |
(Ⅰ)从该公司本月卖出的机器中随机选一台,求这台机器利润率高于0.2的概率;
(Ⅱ)从该公司本月卖出的销售单价为20万元的机器中随机选取
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
(Ⅲ)假设每类机器利润率不变,销售一台第一类机器获利
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee9b42973c53907f09f2de384c42fc5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60fcebe69f231fd83aaeb148e77b1504.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd0c4c71089ffa8b2d6c7a58848325c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60fcebe69f231fd83aaeb148e77b1504.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c85481cd7e94130ef3aa05b4a39e79cd.png)