GRE数学的15条基本概念
1、mode
一堆数中出现频率最高的一个或几个数
e.g. mode of 1,1,1,2,3,0,0,0,5 is 1 and 0
2、range
一堆数中最大和最小数之差
e.g. range of 1,1,2,3,5 is 5-1=4
3、mean
arithmatic mean
geometric mean n个数之积的n次方根
4、median
将一堆数排序之后,正中间的一个数,
或者中间两个数的平均数
e.g. median of 1,7,4,9,2,2,2,2,2,5,8 is 2
median of 1,7,4,9,2,5 is /2=6
5、standard error
一堆数中,每个数与平均数的差的绝对值之和,除以这堆数的个数
e.g. standard error of 0,2,5,7,6 is:
/5=2.4...
上一篇: GRE考试数学单位换算的分析
下一篇: GRE数学中与正态分布有关的知识点
新人教版英语九年《Unit 14 Have you packed yet》word教案
新人教版英语九年《Unit 10 By the time I got outside, the bus had already left》word学案
人教新目标版九年级《Unit 9 When was it invented》word教案
新人教版英语九年《Unit 10 By the time I got outside, the bus had already left》word教案
新人教版英语九年《Unit 1 How do you study for a test》word教案
新目标版英语七上《Unit 3 What color is it》word教案
新目标版英语七上《Unit 3 This is my sister》word教案(一)
新人教版英语七下《Unit 11 What do you think of game shows》word学案
人教新目标版九年级《Unit 7 Where would you like to visit》(公开课)word教案
人教新目标版九年级《Unit 4 What would you do》word说课教案
人教新目标版九年级《Unit 15 We’re trying to save the manatees》word教案2篇
新人教版英语九年《Unit 1 How do you study for a test》word复习学案
人教新目标版九年级《Unit 5 It must belong to Carla》word教案2篇
新人教版英语九年《Review of Units 11-15》word学案
新人教版英语九年《Unit 12 You’re supposed to shake hands》word教案
新目标(Go for it)版初中英语九年级(全一册)全册教案-Unit1-9
新人教版英语八下《Unit 7 Would you mind turning down the music》word学案
人教新目标版九年级《Unit 8 I’ll help clean up the city parks》word教案(5课时)
人教新目标版九年级《Unit 4 What would you do》word复习学案
人教新目标版九年级《Unit 3 Teenagers should be allowed to choose their own clothes学案》word教案
人教新目标版九年级《Unit 6 I like music that I can dance to》word教案
人教新目标版九年级《Unit 2 I used to be afraid of the dark》word教案
新人教版英语九年《Unit 13 Rainy days make me sad》word教案
人教新目标版九年级《Unit 8 I’ll help clean up the city parks》word学案(4课时)
新人教版英语七下《Unit 12 Don’t eat in class》word学案
新人教版英语八下《Unit 7 Would you mind turning down the music》word教案
人教新目标版九年级《Unit 7 Where would you like to visit》word教案
人教新目标版九年级《Unit 9 When was it invented》word说课教案
人教新目标版九年级《Unit 6 I like music that I can dance to》word复习学案
新人教版英语七下《Unit 3 Why do you like koalas》word学案