为了方便广大考生更好的复习,综合整理了GMAT数学辅导系列文章,愿大家都能取得好成绩。
标准方差的计算公式是:
每一个数与这个数列的平均值的差的平方和,除以这个数列的项数,再开根号
分析:
标准方差主要和分母、分之有直接关系
这里的偏差为每一个数与平均值的差。
几个适用的理解:
1.数据分布离平均值越近,标准方差越小;数据分布离平均值越远,标准方差越大。
2.标准方差为0,意味着数列中每一个数都相等。
3.序列中每一个数都加上一个常数,标准方差保持不变的
4.序列中每一个数都乘以不为0的数N,标准方差扩大N倍
体坛英语资讯:China beats Turkey at Intl Womens Volleyball Tournament
体坛英语资讯:Iraq holds S Africa to scoreless draw in Confederations Cup curtain-raiser
体坛英语资讯:Egypt upsets Italy in Confederations Cup
体坛英语资讯:Magic dispatches Cavaliers to make NBA Finals
体坛英语资讯:Romulo leaves Figueirense to return to Flamengo
体坛英语资讯:Lakers viewed as favorites at NBA finals
体坛英语资讯:Kuznetsova wins French Open after long wait
体坛英语资讯:Federer completes Grand Slam sweep
体坛英语资讯:China beats Iran to make first win for new coach Gao
体坛英语资讯:Poor Nadal showing blots Federer record
体坛英语资讯:Rugby may be added to 2016 Olympics roster: Kenyan official
体坛英语资讯:Spain sets winning record by beating South Africa 2-0
体坛英语资讯:Japan beat Chinese duo to be crowned China Open mens doubles
体坛英语资讯:Venus Williams beaten at French Open
体坛英语资讯:Universo evens up Brazilian basketball final against Flamengo
体坛英语资讯:Spain first team into Confederations Cup semis
体坛英语资讯:Bryant clings to Lakers
体坛英语资讯:Painful knee leads to Nadals withdrawal from Wimbledon
体坛英语资讯:France beats 10-man Turkey 1-0 in friendly
体坛英语资讯:South Africa beats New Zealand 2-0 in Confederations Cup
体坛英语资讯:Brazil defeats Egypt 4-3 in Group B match of Confederations Cup
体坛英语资讯:China stuns Germany with 1-1 draw at friendly
体坛英语资讯:Inters Ibrahimovic on sale for good price
体坛英语资讯:Lakers fans congest downtown Los Angeles to celebrate NBA title
体坛英语资讯:China sweep Canada in three-game Sino-Canada Challenge
体坛英语资讯:Corinthians defeats Coritiba in Brazilian Championship
体坛英语资讯:Police warn Lakers fans over NBA championship celebrations
体坛英语资讯:South African govt says all ready for Confederation Cup
体坛英语资讯:Mourinho hopes Chinas enthusiasm inspires team win
体坛英语资讯:Djokovic and Dementieva stunned, Federer and Serena fight through
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |