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。
还有更多关于GMAT机经的内容请关注GMAT,我们将第一时间将最新的GMAT机经分享给大家,同时也希望在考生们利用GMAT机经复习的同时,注重学习方法的总结,考出理想的成绩。
2015考研英语阅读越大越便宜
2015考研英语阅读西班牙内战
2015考研英语阅读疾病传播
2015考研英语阅读鳄鱼救助者
2015考研英语阅读怎样死才算死
2015考研英语阅读点肥成金不现实
2015考研英语阅读加勒特菲茨傑拉德
2015考研英语阅读招聘游戏化
2015考研英语阅读机场安全
2015考研英语阅读谨慎处理儿童问题
2015考研英语阅读人类的头发
2015考研英语阅读社交网站与职位
2015考研英语阅读回到原点的银行
2015考研英语阅美国企业治理
2015考研英语阅读功利主义者绝非善类
2015考研英语阅读英东非海运
2015考研英语阅读美国房市
2015考研英语阅读马雷克爱德曼
2015考研英语阅读书评血色花瓣
2015考研英语阅读尼日利亚回忆录
2015考研英语阅读人类进化史
2015考研英语阅读缅甸IT业
2015考研英语阅读全民天文学
2015考研英语阅读伊莉莎白二世
2015考研英语阅读棉花出口两不讨好
2015考研英语阅读老旧飞机的金属疲劳
2015考研英语阅读美伊问题
2015考研英语阅读永恒的守护者
2015考研英语阅读药品研究
2015考研英语阅读气候和太阳圈
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |