在GMAT数学备考中,考生首先需要了解一部分的GMAT数学概念。只有搞清楚GMAT数学概念,才不至于发生因为看错题目而造成的一些不必要的错误,今天小编就统计类数学概念进行总结,希望可以帮到各位。
GMAT数学概念之统计
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.
如果考生将GMAT数学概念加以归类,思路会更清晰。考生可以根据归类的GMAT数学概念加以复习。对于GMAT数学概念切莫死记硬背,在理解的基础进行记忆一方面是比较方便记忆,一方面还能真正理解单词的含义,提高准确性。
牛津上海版英语九下《Chapter 3 A success story》word同步练习
牛津上海版英语九下《Chapter 2 Educational visits》word同步练习
鲁教版英语九年《Unit 10 It’s important to have a healthy lifestyle》word同步练习
牛津译林版英语九上《Unit 6 Detective stories》word同步测试(一)
牛津译林版英语九上《Unit 3 Teenage problems》word同步测试
牛津译林版英语九上《Unit 1 Star signs》word同步测试(二)
牛津深圳版英语九年《Chapter 1 Body language》word词汇练习
牛津深圳版英语九年《Chapter 4 What should I do》word单元练习
牛津上海版英语九上《Chapter 1 Protecting the innocent》word同步测试3篇
鲁教版英语九年《Unit 11 I’ve broken my arm》word同步练习
鲁教版英语九年《Unit 12 I remember meeting all of you in Grade 6》word知识总结与归纳
鲁教版英语九年《Unit 12 I remember meeting all of you in Grade 6》word同步测试
牛津深圳版英语九年《Chapter 4 What should I do》word同步练习
牛津译林版英语九上《Unit 2 Colour》word同步测试
牛津上海版英语九上《Chapter 5 Fishing with birds》word同步测试3套
牛津深圳版英语九年《Chapter 4 What should I do》word单元复习重点
牛津上海版英语九上《Chapter 7 Comic strips》word同步测试
牛津译林版英语九上《Unit 4 TV programmes》word同步测试
牛津上海版英语九下《Chapter 1 The green consumer》word同步练习
牛津深圳版英语九年9.4《Job hunting》word测试题
鲁教版英语九年《Unit 1 What would you do》word单元测试(1)
牛津深圳版英语九年《Chapter 1 Body language》word综合测试题
牛津深圳版英语九年《Chapter 8 Two geniuse》word课堂练习
牛津沈阳版英语九下《Chapter 4 Tom Sawyer paints the fence》word同步练习(一)
牛津上海版英语九上《Chapter 6 Memory》word同步测试3套
牛津译林版英语九上《Unit 2 Colour》word同步测试(一)
鲁教版英语九年《Unit 1 What would you do》word单元测试(A卷)
鲁教版英语九年《Unit 2 It must belong to Carla》word单元测试(2)
牛津译林版英语九上《Unit 3 Teenage problems》word同步测试(一)
牛津译林版英语九上《Unit 4 TV programmes》word同步测试(一)
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |