二项分布及其应用、正态分布

独立重复试验是研究随机现象的重要途径之一,很多概率模型的建立都以独立重复试验为背景,二项分布就是来自于独立重复试验的一个概率模型.正态分布是概率统计中最重要的一种分布,也是自然界最常见的一种分布.一般说来,若影响某一数量指标的随机因素很多,而每个因素所起的作用都不太大,则这个指标服从正态分布.重点难点在对二项分布及正态分布理解的基础上,能应用二项分布、正态分布模型解决一些简单的实际问题.纵观近几年来的高考试题,在选择题、填空题中考查二项分布及正态分布曲线的特点,在解答题中考查     

“独立重复试验与二项分布”教学设计

独立重复试验与二项分布是概率论中的重要内容.在自然现象和社会现象中,大量的随机变量都服从或近似服从二项分布,它的实际应用广泛,理论上也非常重要.本节课设计了掷骰子试验、掷磁扣试验,让学生在试验中发现问题、分析问题、解决问题,引导学生逐步经历独立重复试验与二项分布概念的形成过程,并能利用伯努利概率公式解决生活中的赛制安排问题.     

对超几何分布的期望公式的探究

超几何分布与二项分布是两个重要的概率模型,它们之间有区别也有联系,譬如,人教A版选修2—3通过一道习题（2．2B组第3题）的探究,从概率的角度揭示了二者之间的一个关系：第一,n次试验中,某一事件A出现的次数x可能服从超几何分布或二项分布．当这n次试验是独立重复试验时,X服从二项分布;当这”次试验是不放回摸球问题,事件A为摸到某种特性（如某种颜色）的球时,     

一道二模概率题引发的思考

超几何分布与二顶分布是两个重要的概率模型,它们之间有区别也有联系,如课本的概念从概率的角度揭示了二者之间的关系:第一,n次试验中,某一事件A出现的次数X可能服从超几何分布或二项分布.当这n次试验是独立重复试验时,服从二项分布;当这n次试验是不放回摸球时,事件A为摸到某种特征(如某种颜色)的球时,X服从超几何分布.但是当袋子中的球的数目N很大时,X的分布列近似于二项分布,并且随着N的增加,这种近似的精度也增加.超几何分布与二项分布从概率角度得到的以上关系可以通过计算观察也易于直观理解,通过以下两个题目,从期望的角度探究二者之间的一个新关系.     

二项分布导、学、练

二项分布直接来源于伯努利试验,它是相互独立事件重复试验的概率分布,二项分布是概率论中3个最重要的概率分布之一,广泛应用于抽样检查,在概率论的理论研究和实际应用中都有很重要的地位,在最近几年高考中,有关二项分布的试题也时有出现。     

独立重复试验与二项分布的教学反思

"独立重复试验与二项分布"是在学生已有概率、二项式定理等知识的基础上,对相互独立事件同时发生的概率问题的进一步深化,同时也为后期研究统计中的二项分布提供了基本模式和理论基础.通过这节课的讲解,笔者对如何在有限的时间内出色地完成这节课的教学任务,颇有感促.     

独立重复试验概率问题的一般公式

教科书高中数学第二册 (下B)第 1 3 2页“独立重复试验”一节的概率公式 ,需作深入理解和全面阐述 ,否则学生处理这类问题时容易程式化 ,硬套公式 ,条件稍作变化便不知所措。1　独立重复试验的概率公式有一定的局限性1 1　概念的理解一般地讲 ,独立重复实验应符合三个条件 :①任两次试验之间是相互独立的 ;②每一次试验都有两个事件 ,且这两个事件是相互对立的 ;③每次试验中的每个事件发生的概率是相同的。当判定一个概率问题是独立重复试验问题时 ,再用其公式求概率。1 2　公式Pn(k) =CknPk( 1 -P) n -k的理解教科书高中数学第二册 (…     

探讨独立重复试验及其概率公式

独立重复试验,也叫做贝努里（Ber—noulli,瑞士数学家和物理学家）试验,是在同样的条件下重复地、各次之间相互独立地进行的一种试验．这种试验在概率论中占有相当重要的地位,因为随机现象的统计规律性只有在大量独立重复试验中才能显示出来．其次,在n次独立重复试验中某事件恰好发生k（k=0,1,2,…,n）次的概率,组成离散型随机变量的一种相当重要的概率分布——二项分布．在这种试验中,     

教你规范n次独立重复试验题型的做题

一、利用n次独立重复试验的概率公式计算概率值 利用n次独立重复试验的概率公式计算概率值应遵循以下要领： 1．首先要明确独立重复试验的定义：指在同样条件下进行的，各次之间相互独立的一种试验．     

准确定位 掌握二项分布题型解题要领

一、二项分布题型定位1.明确二项分布定义在n次独立重复试验中,设事件A发生的次数为X,在每次试验中事件A发生的概率为p,那么在n次独立重复试验中,事件A恰好发生k次的概率为P（X=k）=C_n^kP^k（1-p）^n-k（k=0,1,2,…,n）,此时称随机变量X服从二项分布,记作X～B（n,p）,并称p为成功概率.     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

Western and Eastern culture differences in commercial field

The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity.     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

风的曲线

Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.