高二新课程英语周报2022-2023高二下学期月考卷四答案

高二新课程英语周报2022-2023高二下学期月考卷四答案已经整理完毕，供同学们学习参考，更多英语周报答案，请关注本网站。

19.考向预测……高考对统计与概率的考查主要包括四个方面:(1)抽样方法、样本的数字特征、统计图表、回归分析与独立性检验主要以选择题、填空题形式命题难度较小;(2)注重知识的交汇渗透统计与概率,回归分析与概率是近年命题的热点;(3)以选择题、填空题的形式考查古典概型、几何概型的基本应用,同时渗透互斥事件对立事件;(4)概率常与统计知识结合在一起命题,主要以解答题形式呈现参考答案……(1)样本中服务质量得分的平均数为=55×0.1+65×0.2+75×0.45+85×0.2+95×0.0574.(2分)故可估计M省团长服务质量的平均得分为74分.(3分)(2)按照分层抽样的方法抽取6人,[50,60]中抽2人,记为A,B,(60,70]中抽4人,记为c,d,e,f,从这6人中抽3人的所有可能结果有:(A,B,c),(A,B,d),(A,B,e),(A,B,f),(A,c,d),(A,c,e),(A,c,f),(A,d,e),(A,d,O,(A,e,f,(B,c,d),(B,c,e),(B,c,f),(B,d,e),(B,d,f),(B,e,f),(c,d,e),(c,d,f),(c,e,f),(d,e,f),共20种,(6分)其中恰有1人服务质量得分不超过60分的可能结果有:(A,c,d),(A,c,e),(A,c,f),(A,d,e),(A,d,f),(Ae,f),(B,c,d),(B,c,e),(B,c,,(B,d,e),(B,d,O,(B,e,f,共12种,(7分)根据古典概型概率公式可得P=若=3.(8分)(3)按方案一:所补助的总费用为200x×1.5=200×74×1.5=22200(元).(9分)按方案二所补助的费用为(9×90+0+10)000×1000(11分)比较可知,该社区团购平台采用方案二的补助总金额更高.(12分)

第二节(满分25分)Soon I created my website go. picking up. com. On the website I launched a rubbish removacampaign. I described my purpose-calling on volunteers to pick up rubbish. I posted pictures ofrubbish littered about on the website, which could not only illustrate the severe situation but alsoshow that a large number of volunteers were in great need. Besides, I shared the story of VLady who influenced me so much. Surprisingly, my website gradually became a big hit on theInternetMore and more people put on vests with their own names. Volunteers could be seen pickinup rubbish in their spare time. The yellow vests made beautiful scenery in the park or on thestreet. With our joint efforts the environment became better and better What delighted me mostwas that peoples awareness of environmental protection was improved. The rubbish removalcampaign was a big success. Thanks to Vest Lady who rooted the sense of environmentalprotection in my mind, more people became Vest Lady

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