![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ccf3b6bf1248780bff3aec5d9f79110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://img.xkw.com/dksih/QBM/2018/5/11/1943154605727744/1943567486689280/STEM/f44fa6a5aa794e53b4e2f560575f9cb6.png?resizew=244)
(Ⅰ)视
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d3d4785abb2406e3269e6ee0fd515aa.png)
(Ⅱ)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(Ⅲ)在频率分布直方图的市场需求量分组中,以各组的区间中点值(组中值)代表该组的各个值,并以市场需求量落入该区间的频率作为市场需求量取该组中值的概率(例如
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02f64e6b97bee87f3f195f58ccec8fb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f43c7b771813ed7f4e505741945649f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a4f8425b95d46c6b096aff302de7de6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6faec9e0a1a35fb616575ce358a1f9b.png)
维修次数 | 8 | 9 | 10 | 11 | 12 |
频数 | 10 | 20 | 30 | 30 | 10 |
记
![](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/b6a24198bd04c29321ae5dc5a28fe421.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe08722cf9300fe188dbbb71989c06c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)若要求“维修次数不大于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(3)假设这100台机器在购机的同时每台都购买10次维修服务或每台都购买11次维修服务,分别计算这100台机器在维修上所需费用的平均数,以此作为决策依据,判断购买1台机器的同时应购买10次还是11次维修服务?.
(1)若这个代卖店每天定制15份该种快餐,求该种类型快餐当天的利润y(单位:元)关于当天需求量x(单位:份,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54c50fb5615e36df436d747356b00d78.png)
(2)该代卖点记录了一个月30天的每天19:00之前的销售数量该种快餐日需求量,统计数据如下:
日需求量 | 12 | 13 | 14 | 15 | 16 | 17 |
天数 | 4 | 5 | 6 | 8 | 4 | 3 |
(i)求该种快餐当天的利润不少于52元的概率.
(ii)求这一个月该种快餐的日利润的平均数(精确到0.1).
4 .
甲公司准备向乙公司购买某种主机及相应的易损配置零件,乙公司提出了一种优惠销售方式,即如果购买主机产品同时购买易损配置零件,每个价格300元,否则后期单一购买易损配置零件则每个价格为500元,甲公司为了解主机产品在使用过程中易损配置零件的损耗情况,市场部对50部主机产品使用过程中的易损配置零件的耗情况作了调查并且做了如下的柱状图表:
![](https://img.xkw.com/dksih/QBM/2018/5/2/1936444840517632/1937361885790208/STEM/9f9868c76fe44275b92fde98daa0b2b8.png?resizew=197)
记x表示一个主机使用过程中的易损配置零件数,y表示正常使用一台主机时购买易损配置零件数的费用,n表示购买主机时购买的易损配置零件数
(I)若n=5,写出y与x的函数关系式
(Ⅱ)假设这50部主机在购买时每个主机都购买了6个配置零件,或7个配置零件,分别写出这50部主机在购买配置零件上所需费用的平均数,并以此分析甲公司在购买一台主机时应购买几个配置零件合算?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a425978da20cebf8c4c63953579e7b35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a425978da20cebf8c4c63953579e7b35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f1c0dae96253d76b6264f92024c9403.png)
(1)求超市当天的利润
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fcf9bfbf771cb6118f8e631724314e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47ffb694021b52653de5141ae27ba6d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0412f45301c52963136f57a7e1d48cf1.png)
(2)超市记录了100天面包的日需求量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47ffb694021b52653de5141ae27ba6d0.png)
日需求量 | 140 | 150 | 160 | 170 | 180 | 190 | 200 |
频数 | 10 | 20 | 16 | 16 | 15 | 13 | 10 |
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7cb8662916eda502be2686e1cf7f9dd.png)
②根据每天的平均利润判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7cb8662916eda502be2686e1cf7f9dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7786de583af545fdc88d7edc0b082226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7940cc4c8e2ab7d36f819852b7eb7aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/804f696405f8a3cea67beed83a5431a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2faca11afa8ddaa19cde2e91ee5983f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3248b3b36f1483ffe45c94461876a601.png)
(1)试求出该农机户用于维修保养的费用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d4fc8faefb26b233d4aa9dbef043aae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a2ce3da654984c9e711818fad89e57a.png)
(2)这台收割机使用多少年,可使平均收益最大?(收益=收入-维修保养费用-购买机械费用)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d113b8bdc6afed580aaffe6bd0bec71.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/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1c8ca569e742d9eeee3b85f61bd8e17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3466b71d1d9117438ed50388a57d9397.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/949a9c16450b5a8803b90b48527c042e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/621b99e0b28120f6121acf021b33d9c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f882a2f00277e5981fca7f9354f3ac4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4570c8ee0031c5f0859156e7406a4754.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d13bb8e52dc8aaba6ecb807ca6caa2df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d4cd9a7068de096606d1ab991f5e6da.png)
(1)设该公司产品
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5d69e7fb25c60ee47440a1ece037544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5d69e7fb25c60ee47440a1ece037544.png)
(2)产品
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d4b31ff8c25710c8c0d3480f5c18d3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/110e329d74716ab387dc602bb2b4f998.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ccf3b6bf1248780bff3aec5d9f79110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
需求量/个 | ![]() | ![]() | ![]() | ![]() | ![]() |
天数 | 10 | 20 | 30 | 25 | 15 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f56476e05462ef9de426cb147c65519.png)
(2)估计这
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
(3)元旦这天,该店通过微信展示打分的方式随机抽取了
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e6f1af4b44b2e97e8f319bab4ae9010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ab44a7dc9c035687a33f6e065392359.png)
购买意愿强 | 购买意愿弱 | 合计 | |
女性 | 28 | ||
男性 | 22 | ||
合计 | 28 | 22 | 50 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6531338b32072c1dc000e683bdee60eb.png)
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e3821f70c08c5180e9b3086d3c9610f.png)
0.05 | 0.025 | 0.010 | 0.005 | |
3.841 | 5.024 | 6.635 | 7.879 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8da45c443af7994a26ffa9d8894e7262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
(1)若该代卖店每天定制
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b184c94e38f1e5dbe750b2168c2a37.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ca06304795e9c2c1fd0b4a52eb8d5b9.png)
(2)该代卖店记录了一个月
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b53c7539ed297ea63b9ace6f5cc58ca8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
日需求量 | ||||||
天数 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b184c94e38f1e5dbe750b2168c2a37.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/a87796ee30e6c5d5e6b6285b32abe10c.png)
(ii)若代卖店每天定制
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b184c94e38f1e5dbe750b2168c2a37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b53c7539ed297ea63b9ace6f5cc58ca8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14bbca919dbf6886562d6d28cd57f576.png)
![](https://img.xkw.com/dksih/QBM/2018/10/25/2061340115828736/2063200989863936/STEM/542cd306d15b410f88558d51b54392fb.png?resizew=429)
该函数模型如下:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7304e6af0aa4536846e1deb96717bcd9.png)
根据上述条件,回答以下问题:
(1)试计算喝1瓶啤酒多少小时血液中的酒精含量达到最大值?最大值是多少?
(2)试计算喝一瓶啤酒多少小时后才可以驾车?(时间以整小时计算)
(参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f67428c7906bab46681723e4cbe5fdd.png)