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人教版高中数学选修3离散型随机变量的方差教学设计
3.下结论.依据均值和方差做出结论.跟踪训练2. A、B两个投资项目的利润率分别为随机变量X1和X2，根据市场分析， X1和X2的分布列分别为X1 2% 8% 12% X2 5% 10%P 0.2 0.5 0.3 P 0.8 0.2求：(1)在A、B两个项目上各投资100万元， Y1和Y2分别表示投资项目A和B所获得的利润，求方差D(Y1)和D(Y2)；(2)根据得到的结论，对于投资者有什么建议？ 解：(1)题目可知，投资项目A和B所获得的利润Y1和Y2的分布列为：Y1 2 8 12 Y2 5 10P 0.2 0.5 0.3 P 0.8 0.2所以 ;; 解：(2) 由(1)可知 ，说明投资A项目比投资B项目期望收益要高；同时 ，说明投资A项目比投资B项目的实际收益相对于期望收益的平均波动要更大.因此，对于追求稳定的投资者，投资B项目更合适;而对于更看重利润并且愿意为了高利润承担风险的投资者，投资A项目更合适.
人教版高中数学选修3离散型随机变量的均值教学设计
对于离散型随机变量，可以由它的概率分布列确定与该随机变量相关事件的概率。但在实际问题中，有时我们更感兴趣的是随机变量的某些数字特征。例如，要了解某班同学在一次数学测验中的总体水平，很重要的是看平均分；要了解某班同学数学成绩是否“两极分化”则需要考察这个班数学成绩的方差。我们还常常希望直接通过数字来反映随机变量的某个方面的特征，最常用的有期望与方差.二、 探究新知探究1.甲乙两名射箭运动员射中目标靶的环数的分布列如下表所示：如何比较他们射箭水平的高低呢？环数X 7 8 9 10甲射中的概率 0.1 0.2 0.3 0.4乙射中的概率 0.15 0.25 0.4 0.2类似两组数据的比较,首先比较击中的平均环数,如果平均环数相等，再看稳定性.假设甲射箭n次，射中7环、8环、9环和10环的频率分别为：甲n次射箭射中的平均环数当n足够大时，频率稳定于概率，所以x稳定于7×0.1+8×0.2+9×0.3+10×0.4=9.即甲射中平均环数的稳定值(理论平均值)为9,这个平均值的大小可以反映甲运动员的射箭水平.同理，乙射中环数的平均值为7×0.15+8×0.25+9×0.4+10×0.2=8.65.
人教版高中数学选修3分类变量与列联表教学设计
一、 问题导学前面两节所讨论的变量,如人的身高、树的胸径、树的高度、短跑100m世界纪录和创纪录的时间等,都是数值变量,数值变量的取值为实数.其大小和运算都有实际含义.在现实生活中,人们经常需要回答一定范围内的两种现象或性质之间是否存在关联性或相互影响的问题.例如,就读不同学校是否对学生的成绩有影响,不同班级学生用于体育锻炼的时间是否有差别,吸烟是否会增加患肺癌的风险,等等,本节将要学习的独立性检验方法为我们提供了解决这类问题的方案。在讨论上述问题时,为了表述方便,我们经常会使用一种特殊的随机变量,以区别不同的现象或性质,这类随机变量称为分类变量.分类变量的取值可以用实数表示,例如,学生所在的班级可以用1,2,3等表示,男性、女性可以用1,0表示,等等.在很多时候,这些数值只作为编号使用,并没有通常的大小和运算意义,本节我们主要讨论取值于{0,1}的分类变量的关联性问题.
人教版高中数学选修3离散型随机变量及其分布列(2)教学设计
温故知新 1.离散型随机变量的定义可能取值为有限个或可以一一列举的随机变量,我们称为离散型随机变量.通常用大写英文字母表示随机变量,例如X,Y,Z;用小写英文字母表示随机变量的取值,例如x,y,z.随机变量的特点: 试验之前可以判断其可能出现的所有值，在试验之前不可能确定取何值；可以用数字表示2、随机变量的分类①离散型随机变量:X的取值可一、一列出；②连续型随机变量:X可以取某个区间内的一切值随机变量将随机事件的结果数量化．3、古典概型:①试验中所有可能出现的基本事件只有有限个；②每个基本事件出现的可能性相等。二、探究新知探究1.抛掷一枚骰子,所得的点数X有哪些值？取每个值的概率是多少？ 因为X取值范围是{1，2，3，4，5，6}而且"P(X=m)"=1/6,m=1,2,3,4,5,6.因此X分布列如下表所示
大班科学教案：小动物之间的联络2
【活动准备】1、准备蚂蚁、蟋蟀、蜜蜂、孔雀等动物的图片。2、《小动物之间的联系方式》的录相。3、活动前，请幼儿找相关资料，简单了解小动物传递信息的方式及幼儿查找的小动物联络图文表。【活动过程】一、随音乐〈〈大家一起来〉〉进入活动场地 教师用拥抱、握手、拉幼儿舞蹈、动作、图画、语言等方式，让幼儿感受人类传递信息的方式方法（有动作、图文、声音、表情、新闻媒体等方式）从而印发幼儿了解动物之间的联络方式。
网上教学教师个人心得体会参考范文
但我校网络学习在体现共性特征的同时，也彰显着学科特性，在教研组的统筹规划下，各学科教学工作扎实有效。语文学科坚持落实语文核心素养，针对不同年级学生及当前考纲要求，对学生提出针对性的指导方法，例如高三年级结合当前考试要求，强化学生对时事新闻的解读能力，非毕业年级强化学生的日常学习积累能力。数学学科根据不同学生的实际情况，有针对性的提出作业训练，同时通过抽查等方式，落实对学生的训练成效。英语学科强化对不同考点的专题训练，有计划的开展对听力、阅读理解、完形填空等题型的专项训练，重在积累。综合学科加强合作，强化素材整理及综合训练，将时间进行有机协调，落实综合学习成效。
网上教学教师个人心得体会参考范文
但我校网络学习在体现共性特征的同时，也彰显着学科特性，在教研组的统筹规划下，各学科教学工作扎实有效。语文学科坚持落实语文核心素养，针对不同年级学生及当前考纲要求，对学生提出针对性的指导方法，例如高三年级结合当前考试要求，强化学生对时事新闻的解读能力，非毕业年级强化学生的日常学习积累能力。数学学科根据不同学生的实际情况，有针对性的提出作业训练，同时通过抽查等方式，落实对学生的训练成效。英语学科强化对不同考点的专题训练，有计划的开展对听力、阅读理解、完形填空等题型的专项训练，重在积累。综合学科加强合作，强化素材整理及综合训练，将时间进行有机协调，落实综合学习成效。
小班数学教案 学习2的加法
活动目标：1、创设情境，让幼儿在操作过程中尝试列出得数是2的加法算式，理解加号、等于号的含义。2、感知加法算式所表达的数量关系。3、在活动中体验游戏的愉悦，提高幼儿学习数学的兴趣。 活动准备： 物质准备：1、城堡图一幅（三层）第一层：鱼塘第二层：花园第三层：水果店 （1条热带鱼+1条金鱼=1条热带鱼1条金鱼）图一幅 2、幼儿操作材料（+、=40个，数字1、1、2各40张）、水果用具若干（每名幼儿两种）、水果购物券84张 知识准备：幼儿会以游戏的方式进行2的组成
小班数学教案：瓢虫找家（点数）
2、培养按数量归类的能力。 3、通过游戏，提高对数学活动的兴趣。 活动准备： 有1、2、3个斑点的瓢虫图片若干；分别粘有1、2、3个圆点的树叶3片；小纸虫若干；儿歌录音：小瓢虫。 活动过程： 一、游戏导入 师幼共同玩手指游戏：小瓢虫。 二、利用图片，练习手口一致数3以内的数。 通过数瓢虫身上的斑点及瓢虫数，巩固数数1、2、3。
小班数学教案 ６以内的点数
【活动目标】1．发展幼儿对颜色、6以内数量的感知。2．幼儿能尝试简单的分类。3．体验快乐的情绪。 【活动准备】 红、黄、绿花若干；红、黄、绿圆点即时贴若干；白色纸花，花心分别为红、黄、绿，花瓣为4、5、6片；音乐磁带《春天》《找朋友》；贴有数字4、5、6的三个花篮。
小班数学教案：按大小对应排序
2、 在活动过程中根据物体的大小特征匹配相应大小的物体。3、 尝试用语言讲述操作过程。活动过程：1、 集体活动。 （1） 给四只大小不同的小猫排序。 教师出示图片小猫，提问：它们是谁？一共有几只？他们有什么不一样？谁会帮它们排队？先带领幼儿数数1、2、3、4只猫，然后大家确定开始的地方，幼儿上来排序，其他幼儿看排大的对不对，并集体讲述她是怎么排序的。（2） 给小猫送鱼。 教师出示三条鱼的图片。问：这是什么？谁最爱吃鱼？那我们把这些鱼送给小猫好吗？看看这些鱼有什么不一样？想想应该怎么送？幼儿操作，师生共同检查，教师引导说出：最小的鱼送给最小的猫，大一点鱼送给大一点的猫，最大的鱼送给最大的猫。大家集体练习一次。
小班数学教案：苹果全家福（大小）
2、知道家有几口，感受家的快乐。 活动准备： 大苹果胸饰一个（正面红色，背面绿色）；小苹果胸饰一个；人手一份苹果脸谱；苹果树（挂着与幼儿人数相同的大小，红、绿苹果。）；苹果全家福一张；眼镜、头发、小圆片等若干。鼓、录音机、像机。 活动过程： 一、创设情景，激起兴趣 1、观看教师大苹果胸饰，区分颜色。分别观看两教师胸饰，学习区分大小。 2、摘苹果活动：比一比、讲一讲，初步分清大小、颜色。
中班科学教案：花儿的礼物
2、创造性地设计花的礼物，使幼儿进一步萌发爱花、护花的意识。 活动准备： 场地布置（花仙子的花园） 金银花露、玫瑰花茶、菊花茶、桂花糕、蜂蜜、花卉精油、熏香用品、干花袋、花朵装饰品、春姑娘图片、花朵头箍、纸、记号笔。 活动流程： 观察环境，引出主题—观察尝试，操作发现—自我创造、描述构思—情感激发 一、观察环境，感知花的美1、带入场地：今天我们去花仙子的花园玩，好吗？2、观察环境：你们觉得花仙子的花园怎么样？为什么漂亮？ 看见花你感到怎么样？
新人教版高中英语必修3Unit 1 Festivals and celebrations-Discovering Useful Structure教学设计
4.That was an experience that frightened everyone. →That was _____________________. 答案：1. taking 2. being discussed 3. in the reading room 4. a frightening experienceStep 6 The meaning and function of V-ing as the predicative动词-ing形式作表语，它通常位于系动词后面，用以说明主语“是什么”或“怎么样”一种表示主语的特质、特征和状态, 其作用相当于形容词; 另一种具体说明主语的内容, 即主语等同于表语, 两者可互换。The music they are playing sounds so exciting. 他们演奏的音乐听起来令人激动。The result is disappointing. 结果令人失望。Our job is playing all kinds of music. 我们的工作就是演奏各种音乐。Seeing is believing. 眼见为实。Step 7 Practice1. It is ________(amaze) that the boy is able to solve the problem so quickly.2. Buying a car is simply _______(waste) money. 3. Please stop making the noise—it’s getting ________(annoy). 4. complete the passage with the appropriate -ing form.La Tomatina is a festival that takes place in the Spanish town Bunol every August. I think many food festivals are __________ because people are just eating. however, this festival is _________ because people don't actually eat the tomatoes. Instead, they throw them at each other! the number of people ________ part in this tomato fight, can reach up to 20,000, and it is a very __________ fight that lasts for a whole hour. The _______ thing is how clean Bunol is after the tomatoes are washed away after the fight. this is because the juice form tomatoes is really good for making surfaces clean!答案：1. amazing 2. wasting 3. annoying4. boring interesting taking exciting amazing
新人教版高中英语必修3Unit 1 Festivals and Celebrations-Reading and Thinking教学设计
The topic of this part is “Discover the reasons for festivals and celebrations.The Listening & Speaking & Talking part aims at talking about the experiences and feelings or emotions about the festivals and celebrations. This section aims at detecting the reason why the people celebrate the festivals, the time, the places, the types and the way of celebrations. It also explains why some traditions in the old celebrations are disappearing, like the firecrackers in the big cities and some new things are appearing like the prosperity of business or commerce. 1. Students can talk about what festivals they know and the reasons and the way of celebrating them.2. Students should learn the reading skills such as the headline and get the topic sentences, the structures of articles.3. Students can understand the past, the present situation of some festival around the world and why there are some changes about them. 4. Students can have the international awareness about the festivals.1. Students should learn the reading skills such as the headline and get the topic sentences, the structures of articles.2. Students can understand the past, the present situation of some festival around the world and why there are some changes about them.Step 1 Lead in---Small talkWhat festival do you like best ? Why ?I like the Spring Festivals because I can set off the fireworks, receive the lucky money and enjoy the Gala with my families.Step 2 Before reading---Pair workWhy do people celebrate different festivals ?The Spring Festivals is to celebrate the end of winter and the coming of spring and new life.The Mid-autumn Day is to celebrate the harvest and admire the moon.
新人教版高中英语必修3Unit 1 Festivals and Celebrations-Listening &Speaking＆Talking教学设计
The theme of this section is “Talk about festival activities and festival experiences”.Festival and holiday is a relaxing and interesting topic for students. This part talks about the topic from the daily life of students’. In the part A ---Listening and Speaking, there are three conversations among different speakers from three countries(Japan, Rio and China), where the speakers are participating in or going to participate in the festivals and celebrations. So listening for the relationship among them is a fundamental task. Actually, with the globalization and more international communication, it is normal for Chinese or foreigners to witness different festivals and celebrations in or out of China. In the Conversation 1, a foreign reporter is interviewing a Japanese young girl who just had participated in the ceremony of the Coming-of-Age Day on the street and asking her feeling about the ceremony and the afterwards activities. Conversation 2, Chinese girl Li Mei is witnessing the Rio Carnival for the first time, and her friend Carla gives her some advice on the costumes which enables her to match with the carnival to have a good time. Conversation 3, a Chinese guide is showing a group of foreign visitors around the Lantern Festival and introducing the customs of the festival to them. The three conversations have a strong vitality and insert the festival and cultural elements from different countries. So perceiving the festivals and cultures from different countries is the second task. At the same time, the scripts also insert the targeted grammar --- v-ing as attributive and predicative, which students can perceive and experience in a real context and make a road for the further study. That is the third task. In the Part B--- Listening and Talking, the theme is “Talk about festival experience”, which is the common topic in our daily conversations. During the conversation, Song Lin, a Chinese student, asked Canadian friend Max about how to spend Christmas. In the conversation, Song Lin talked about experience and the feelings during the Chinese Spring Festival, during which there are not only some enjoyable things but some unpleasant things. After the listening, perhaps students find there are some similarities between Christmas and the Chinese Spring Festival as there are some differences in the origins and celebrations. For example, people always visit friends and relatives, decorate their houses, have a big dinner together, chat and give presents to each other.
新人教版高中英语必修3Unit 1 Festivals and Celebrations-Reading for writing教学设计二
Step 3 Analyzing article structureActivity 31. Teachers raise questions to guide students to analyze the chapter structure of this diary and think about how to describe the festival experience. (1)What should be included in the opening/body/closing paragraph(s)?(2)How did the writer arrange his/her ideas?(3)What kind of interesting details did the writer describe?(4)How did the writer describe his/her feelings/emotions during the event?2. Students read and compare the three sentence patterns in activity 2. Try to rewrite the first paragraph of the diary with these three sentence patterns. After that, students exchange corrections with their partners. Such as:●This was my first time spending three days experiencing the Naadam Festival in China’s Inner Mongolia Autonomous Region and it was an enjoyable and exciting experience. ●I'll never forget my experience at the Naadam Festival because it was my first time to watch the exciting Mongolian games of horse racing, wrestling, and archery so closely. ●I'll always remember my first experience at the Naadam Festival in China’s Inner Mongolia Autonomous Region because it was so amazing to spend three days witnessing a grand Mongolian ceremony. Step 4 Accumulation of statementsActivity 41. Ask the students to read the diary again. Look for sentences that express feelings and emotions, especially those with the -ing form and the past participle. Such as:● …horse racing, wrestling, and archery, which are all so exciting to watch. ● some amazing performances● I was surprised to see…● I was a little worried about. . . ● feeling really tiredOther emotional statements:●I absolutely enjoyed the archery, too, but the horse races were my favourite part. ●I'm finally back home now, feeling really tired, but celebrating Naadam with my friend was totally worth it. ●He invited me back for the winter to stay in a traditional Mongolian tent and cat hot pot. I can’t wait!2. In addition to the use of the -ing form and the past participle, the teacher should guide the students in the appreciation of these statements, ask them to memorize them, and encourage them to use them reasonably in writing practice.
新人教版高中英语必修3Unit 2 Morals and Virtues-Discovering Useful Structure教学设计
1. 表示时间。Hearing these stories, I’m skeptical about the place. = When I heard these stories. . . 2. 表示原因。Not knowing his address, I can’t send this book to him. = Because/Since/As I don’t know his address. . . 3. 表示结果。His father died, leaving him a lot of money. =. . . and left him a lot of money4. 表示条件。Going straight down the road, you will find the department store. = If you go straight down the road. . . 5. 表示让步。Being tired, they went on working. =Although they were tired. . . 6. 表示行为方式、伴随情况或补充说明。He lay on the grass, staring at the sky for a long time. =. . . and stared at the sky for a long time注意：非谓语动词作状语时, 如所提供的动词不能和句子中的主语保持一致, 动词-ing形式必须有自己的逻辑主语, 通常由名词或代词来担任, 这就是独立主格结构。The last bus having gone, we had to walk home. (having gone的逻辑主语是the last bus, 而不是we)Weather permitting, the football match will be played on Friday. (permitting的逻辑主语是time, 而不是the football match)Step 7 Practice1. ________(study) hard, you are sure to get first prize. 2. People use plastic in their daily life, _______(leave) large amounts of waste. 3. ________(work) hard at your lessons, you are to succeed. 4. The old man, ____________(work) abroad for twenty years, is on the way back to his motherland. 5. ______________(finish) his homework, he was playing on the playground. Answers: 1. Studying 2. leaving 3. Working 4.having worked 5. Having finishedStep 8 HomeworkFinish the homework on Page 22.
新人教版高中英语必修3Unit 2 Morals and Virtues-Listening &Speaking＆Talking教学设计
Example:One day, a poor boy who was trying to pay his way through school by sending newspapers door to door found that he only had one dime(一角）left. He was so hungry that he decided to beg for a meal at the next house.However, he lost his nerve when a lovely young woman opened the door. Instead of a meal he asked for a drink of water. She thought he looked hungry so she brought him a large glass of milk. He drank it slowly, and then asked, “How much do I owe you?” “You don’t owe me anything,” she replied, “Mother has taught me never to accept pay for a kindness.” “Then I thank you from the bottom of my heart.” With these words, Howard Kelly left that house.Years later the woman became badly ill and was finally sent to the hospital in a big city. Dr. Howard Kelly, now famous, was called in. When he heard the name of the town she came from, a strange light filled his eyes. Dressed in his doctor’s clothes, Dr. Kelly went into her room and recognized her at once. From that day on, he gave special attention to her, and decided to do his best to save her life.At last the woman was saved. Dr. Kelly asked the business office to pass the final bill to him. He looked at it and then wrote something on the side. The bill was sent to the woman’s room. She was afraid to open it because she was sure that it would take the rest of her life to pay for it off. Finally she looked, and the note on the side of the bill caught her attention. She read these words: “Paid in full with a glass of milk, Dr. Howard Kelly.” Tear of joy flooded her eyes.
新人教版高中英语必修3Unit 2 Morals and Virtues-Reading and Thinking教学设计
The topic of this part is “Learn to make choices in life”.The Listening & Speaking & Talking part aims at the moral dilemmas, and this part is about making choices in life. The heroin is Lin Qiaozhi, a famous medical scientist, made a great contribution to our country’s medical care. Most importantly, her life experience can inspire our students whether in studying or the development of career. she had moral dilemmas and life choices, which are similar to the students who will step into society. Besides, Lin has quite good virtues like kindness, self-improvement, insistence, job-loving , generosity and responsibility, which is worth being learned.Concretely, this article is a biography about Lin Qiaozhi. The article tells her whole life according the timeline, among which the life choices is emphasized. For example, whether married or chased her dream, returned home or stayed abroad, family or public, her choices all reflected her faith, spirit, responsibility and devotion.1. Fast reading to get the detailed information about Lin Qiaozhi; careful reading to do the deductive information.2. Learn the reading skills--deductive judgement according the context.3. Study the structure features and language features. 4. Communicate about Lin’s life choices and reflect their own life choices.1. Learn the reading skills--deductive judgement according the context.2. Study the structure features and language features.3. Communicate about Lin’s life choices and reflect their own life choices.Step 1 Lead in---Small talkWhat are some important life choices?Importance choices: university study, jobs and marriage partners. Because they can determine our future.
