![](https://img.xkw.com/dksih/QBM/2021/11/8/2846752386367488/2850540071247872/STEM/39040b23-fa3c-468e-9d89-238fe87598f7.png?resizew=426)
(1)指出这30名男教师学习积分的中位数;
(2)由茎叶图完成下面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
男教师 | 女教师 | 合计 | |
活跃 | |||
不活跃 | |||
合计 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bf3baba074e8aeb6f3ea117865bbd1b.png)
参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e3821f70c08c5180e9b3086d3c9610f.png)
临界值表:
![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
(1)先完成关于商品和服务评价的2×2列联表,再判断能否在犯错误的概率不超过0.001的前提下,认为商品好评与服务好评有关?
关于商品和服务评价的2×2列联表:
对服务好评 | 对服务不满意 | 合计 | |
对商品好评 | 30 | ||
对商品不满意 | 60 | ||
合计 | 300 |
附临界值表:
0.15 | 0.10 | 0.05 | 0.025 | 0.010 | 0.005 | 0.001 | |
2.072 | 2.706 | 3.841 | 5.024 | 6.635 | 7.879 | 10.828 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2581192317ef233ccdccfc48ac29b52b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e8b00eb093497be0317188ecf33ce52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
(1)先完成关于商品和服务评价的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
关于商品和服务评价的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
对服务好评 | 对服务不满意 | 合计 | |
对商品好评 | ![]() | ||
对商品不满意 | ![]() | ||
合计 | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
附临界值表:
![]() | 0.15 | 0.10 | 0.05 | 0.025 | 0.010 | 0.005 | 0.001 |
![]() | 2.072 | 2.706 | 3.841 | 5.024 | 6.635 | 7.879 | 10.828 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2581192317ef233ccdccfc48ac29b52b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee7325a47cab9fc1a145e234906f53b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/6e49e1a2-7c39-4b8d-9177-7ad72a712d0d.png?resizew=164)
(Ⅰ)根据茎叶图绘制
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/884d40443dee7b58456efda6e09d650a.png)
(Ⅱ)若先从
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
参考数据及公式如下:
0.1 | 0.05 | 0.025 | 0.01 | 0.005 | 0.001 | |
2.706 | 3.841 | 5.024 | 6.635 | 7.879 | 10.828 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e3821f70c08c5180e9b3086d3c9610f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
非老年人人数 | 老年人人数 | 合计 | |
已感染人数 | 5 | 15 | 20 |
未感染人数 | 30 | 50 | |
合计 | 35 | 35 | 70 |
(2)为了研究病毒的某项特征,疾控部门需要从已被感人的上述20人中随机采集2人的血液样本,其中被采集到血液的老年人的人数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c1116ce7f5a1a7b57517276d5092fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c1116ce7f5a1a7b57517276d5092fa.png)
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc485c58dbd6e50bfb352030f4a1c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
0.10 | 0.05 | 0.01 | 0.005 | |
2.706 | 3.841 | 6.635 | 7.879 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/4354476b-1c2e-4f2d-bfcb-5a01ade1edae.png?resizew=302)
(Ⅰ)求实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c85481cd7e94130ef3aa05b4a39e79cd.png)
(Ⅱ)已知抽取的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
参考数据及公式如下:
0.050 | 0.010 | 0.001 | |
3.841 | 6.635 | 10.828 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc485c58dbd6e50bfb352030f4a1c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2824ba82c2227475c27a9fea5e30245a.png)
抽查数据 | 频数 | |
零甲 | 零乙 | |
4 | 2 | |
8 | 12 | |
16 | 18 | |
8 | 6 | |
4 | 2 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
(2)由以上统计数据完成下面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
零甲 | 零乙 | 合计 | |
优秀 | |||
不够优秀 | |||
合计 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e3821f70c08c5180e9b3086d3c9610f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
0.15 | 0.10 | 0.05 | 0.025 | 0.010 | 0.005 | 0.001 | |
2.072 | 2.706 | 3.841 | 5.024 | 6.635 | 7.879 | 10.828 |
![](https://img.xkw.com/dksih/QBM/2020/5/12/2461211235688448/2461597440729088/STEM/9697db2e9ed74c8784b3d4fd3556be9d.png?resizew=554)
(1)求被调查者中肥胖人群的BMI平均值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
(2)填写下面列联表,并判断是否有99.9%的把握认为35岁以上成人患高血压与肥胖有关.
![]() | 0.050 | 0.010 | 0.001 |
k | 3.841 | 6.635 | 10.828 |
肥胖 | 不肥胖 | 合计 | |
高血压 | |||
非高血压 | |||
合计 |
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc485c58dbd6e50bfb352030f4a1c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
特别满意 | 基本满意 | |
男 | 80 | 20 |
女 | 95 | 5 |
(1)被调查的男性居民中有5个年轻人,其中有2名对志愿者所买生活用品特别满意,现在这5名年轻人中随机抽取3人,求至多有1人特别满意的概率.
(2)能否有99%的把握认为男、女居民对志愿者所买生活用品的评价有差异?
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc485c58dbd6e50bfb352030f4a1c42.png)
![]() | ![]() | ![]() | ![]() |
![]() | ![]() | ![]() | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80493e984dd861c5315f536b20c92b29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
男性 | 女性 | 合计 | |
参加 | 10 | ||
没参加 | 8 | ||
合计 | 30 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bf1ff64281c78fe2b96e8ffb166afd2.png)
(1)完成答题卡上的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28b4b06478c218a0e3421f8c52427c8b.png)
(2)已知参加彩跑的女性中共有4人跑完了全程,若从参加彩跑的6名女性中任选两人,求选出的两人均跑完了全程的概率.
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e3821f70c08c5180e9b3086d3c9610f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
0.15 | 0.10 | 0.05 | 0.025 | 0.010 | 0.005 | 0.001 | |
2.072 | 2.706 | 3.841 | 5.024 | 6.635 | 7.879 | 10.828 |