quartile就是小于median的所有数的median, hehe就是将所有的统计标本按顺序排列,再从头到尾分为个数相同的4堆quartile就是第一堆的最后一个,或是第二堆的第一个题目中,50个数,一定知道median是第25个或第26个同样,quartile是第12或是13个,the third quartile当然是37或是38个至于到底是37还是38,GRE不会为难你的,这两个数肯定一样
对Quartile的说明:Quartile:
第0个Quartile实际为通常所说的最小值
第1个Quartile
第2个Quartile实际为通常所说的中分位数
第3个Quartile
第4个Quartile实际为通常所说的最大值
我想大家除了对1st、3rd Quartile不了解外,对其他几个统计量的求法都是比较熟悉的了,而求1st、3rd是比较麻烦的,下面以求1rd为例:
设样本数为n,可以按下列步骤求1st Quartile:
将n个数从小到大排列,求/4,设商为i,余数为j
则可求得1st Quartile为:/4+j/4
例:
1.设序列为{5},只有一个样本则:/4 商0,余数0
Unit 9 When was it invented Section B reading新目标
unit 7 Where would you like to visit Section B 3a新目标
unit 9 When was it invented section B period two新目标
形容词及副词的复习
Im going to be a basketball player
Unit 5 If you go to the party, youll have a great time![下学期] 新目标
Unit 5 If you go to the party, youll have a great time.Section A新目标
unit 11 Could you please tell me where the restrooms are sectionA period 2新目标
Unit 8 I’ll help clean up the city parks. Period 1, 2新目标
Unit 10 复习课[上学期]
Unit 7 How do you make a banana smoothie 课件八
Ask the way
Unit 9 When was it invented Section A新目标
unit 14 have you packed yet reading material新目标
Unit 5 can you come to my party新目标
Unit 8 I’ll help clean up the city parks.Section A新目标
It must belong to Carla
新目标七年级上 starter Unit 2 课件
Lesson42Whats the weather like
U nit6 i am more outgoing than my sister[上学期] 新目标
Unit 7 Would you mind turning down the music
Unit 12 You’re supposed to shake hands.Reading material 新目标
新目标七下unit 3 why do you like koalas
unit 13 Rainy days make me sad. reading material.[下学期] 新目标
go for it 八上 unit 9 section A新目标
unit 2 I used to be afaird of the dark新目标
Unit 5 Can you come to my party1
unit 13 rainy days make me sad. reading material新目标
Alibabas farm
unit 9 When was it invented period 2[上学期] 新目标
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |