无论是参加过或者正准备参加GMAT数学考试的考生,都发现了GMAT数学基本概念名目种类繁多,记忆起来困难重重。其实,他们没有将GMAT数学的所有基本概念归类,造成记忆出现混乱。GMAT数学的基本概念真的有那么多吗?我们应该如何把握?且看本文给你晒晒。
描述统计
1.平均数
2.中数
To calculate the median of n numbers,first order the numbers from least to greatest;if n is odd,the median is defined as the middle number,while if n is even,the median is defined as the average of the two middle numbers. For the data 6, 4, 7, 10, 4, the numbers, in order, are 4, 4, 6, 7, 10, and the median is 6, the middle number. For the numbers 4, 6, 6, 8, 9, 12, the median is /2 = 7. Note that the mean of these numbers is 7.5.
3.众数:一组数中的众数是指出现频率最高的数。
例:the mode of 7,9,6,7,2,1 is 7。
4.值域:表明数的分布的量,其被定义为最大值减最小值的差。
例:the range of1,7,27,27,36 is 36-= 37。
5.标准方差:
One of the most common measures of dispersion is the standard deviation. Generally speaking, the greater the data are spread away from the mean, the greater the standard deviation. The standard deviation of n numbers can be calculated as follows:
find the arithmetic mean ;
find the differences between the mean and each of the n numbers ;
square each of the differences ;
find the average of the squared differences ;
take the nonnegative square root of this average.
Notice that the standard deviation depends on every data value, although it depends most on values that are farthest from the mean. This is why a distribution with data grouped closely around the mean will have a smaller standard deviation than data spread far from the mean.
GMAT数学的基本概念,如果考生加以归类,会感觉没有想象中那么复杂和混乱。考生可以根据归类的GMAT数学基本概念,加以复习和记忆。还要提醒考生的是,GMAT数学的基本概念,最忌讳的是死记硬背,考生最好采用理解式记忆法,GMAT数学基本概念就能轻松搞定。
小学英语作文A Wonderful Day
小升初英语作文:暑假
小学英语奥赛范文:My good friend
小升初英语作文:Sportsmanship 运动精神
关于动物的英语作文-大象
小学英语奥赛范文:Help mum do the housework
小升初英语作文 我的姐妹
My winter holiday 英语作文2
My winter holiday 英语作文4
小升初英语小作文:我的朋友
英语作文 人与动物(The man and animals)
小学英语奥赛范文:A family
小升初作文:写自己喜欢吃的食物
小升初作文Protect environment(环境保护)
父亲节 Father's Day
关于你最喜爱的动物 英语作文
写人作文 英语
小学英语奥赛范文:Myself
小学英语奥赛范文:Sweet teacher
五一长假英语作文:“我的五一”
小升初英语作文:A Wonderful Day 美好的一天
小学英语奥赛范文:My Pet
小学英语奥赛范文:A letter to Dad
My Dog 英语作文
2008北京奥运会英语作文 福娃首次亮相MV
欢迎你到北京动物园_英语作文
My winter holiday 英语作文
短篇英语作文:逛动物园
My winter holiday 英语作文3
关于火的英语作文
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |