1 . 为了了解某次数学竞赛中
名学生的成绩,从中抽取一个容量为
的样本,则每名学生成绩入样的机会是_________________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dadc63e6e33743ce590ed968948a5a58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
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2 . 天气预报是气象专家根据预测的气象资料和专家们的实际经验,经过分析推断得到的,在现实的生产生活中有着重要的意义,某快餐企业的营销部门对数据分析发现,企业经营情况与降雨填上和降雨量的大小有关.
(1)天气预报所,在今后的三天中,每一天降雨的概率为40%,该营销部分通过设计模拟实验的方法研究三天中恰有两天降雨的概率,利用计算机产生0大9之间取整数值的随机数,并用
表示下雨,其余
个数字表示不下雨,产生了20组随机数:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afaceabc30c5d1bf842fca92a1c22b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/185f0e319862ee7dfd768f8dc64f4a8a.png)
求由随机模拟的方法得到的概率值;
(2)经过数据分析,一天内降雨量的大小
(单位:毫米)与其出售的快餐份数
成线性相关关系,该营销部门统计了降雨量与出售的快餐份数的数据如下:
试建立
关于
的回归方程,为尽量满足顾客要求又不在造成过多浪费,预测降雨量为6毫米时需要准备的快餐份数.(结果四舍五入保留整数)
附注:回归方程
中斜率和截距的最小二乘法估计公式分别为:
,
(1)天气预报所,在今后的三天中,每一天降雨的概率为40%,该营销部分通过设计模拟实验的方法研究三天中恰有两天降雨的概率,利用计算机产生0大9之间取整数值的随机数,并用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f14db37344529d273e36d835241d0d39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4287d756937e7b1a71ce5cfb2fc05cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f4e7c6bebd19595c28522d2f4b273d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b81940df5d9679990fa74aad46318a68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bde0b80d15ddfba7a6edfed73e7cfc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fbd6636656c80c77e28cff098792ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c817b794a1a5d523555fcc3397d25c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d255ec1e895304d394e94cf3fe0eeb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d01a459b70f3196f1dbff9f020814b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfa764c2eec2c72126b4e2b531de3c63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afaceabc30c5d1bf842fca92a1c22b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79f97e34593826b960103f57701e1f5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eef4dfe2551509bf0bc073e535d8eaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/387db57c53f4826beb7ad2293afba13d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75ac31f58e4399b01ed85da386737dc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b61d34ac5d773e916a5a6049ca1ce27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3baf97ffef03c4e23958a8000ef162c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194e65cdf017d49bfeb076f19a0d2a17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9d8a0b16ddec8c83615561c1f6febf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ceb52ed95bca295fa25467232a9c656.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/185f0e319862ee7dfd768f8dc64f4a8a.png)
求由随机模拟的方法得到的概率值;
(2)经过数据分析,一天内降雨量的大小
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
降雨量(毫米) | 1 | 2 | 3 | 4 | 5 |
快餐数(份) | 50 | 85 | 115 | 140 | 160 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
附注:回归方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1db6103cb0f1d2bd6b19235d53ee7e98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c15a7d84893403fde125e2ce229dafe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a40ea92b18e6a33485441818d471945f.png)
您最近一年使用:0次
2017-05-10更新
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119次组卷
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3卷引用:河北省石家庄市2017届高三毕业班第二次模拟考试数学(文)试题