1、random variable

random variable發(fā)音

英：　　美：

random variable中文意思翻譯

常用釋義：隨機變量：在統計實(shí)驗中

隨機變量，隨機變數，無(wú)規變數

[數]隨機變數，[數]隨機變量；無(wú)規變量

random variable雙語(yǔ)使用場(chǎng)景

1、Do The Function of A Continuous Type of Random Variable Also Belong To One?───連續型隨機變量的函數還是連續型隨機變量 嗎 ?

2、The variance of a random variable is the square of its standard deviation.───方差的算術(shù)平方根為該組數據的標準差.

3、The weighted mean of the random variable is the expected value.───隨機變量的加權平均值是期望值。

4、variable is a function that takes values based on a probability distribution.───變量是一個(gè)根據概率分布取值的函數。

5、This article's emphasis studies the random variable using the copula function to describe tail dependence.───本文的重點(diǎn)就是應用copula函數來(lái)研究隨機變量的尾部相關(guān)性的問(wèn)題.

6、might be an infinite number of possible values for the random variable x.───對于這個(gè)隨機變量X，可能的取值個(gè)數是無(wú)限的。

7、Firstly, the definitions of complex quasi - random variable and primary norm are introduced.───引入復擬(概率)隨機變量, 準范數的定義.

8、Property of symmetric random variable is discussed by introducing the concept of almost supremum and infimum.───討論了具有倒對稱(chēng)隨機變量的若干性質(zhì).

9、In credibility model, we regard risk X a random variable which is depend on a parameter.───在可信性模型中, 通常把風(fēng)險X的視為依賴(lài)于一參數的隨機變量.

10、Based on random variable expectation and variance, some inequalities are proved.───基于隨機變量的數學(xué)期望與方差, 討論隨機變量數字特征的幾個(gè)不等式.

random variable相似詞語(yǔ)短語(yǔ)

1、response variable───反應變量

2、dummy variable───[數]啞變量；名義變數；虛變數

3、random variables───隨機變量；隨機變數

4、response variables───反應變數

5、dependent variable───因變量；他變數；[數]應變數

6、random rubble───亂砌毛石

7、random sample───[數]隨機樣本；隨意抽取調查；[天]隨機樣品

2、Expected value for continuous random variable

myisland8132: 好嘢㖞

咁都記得

你講得無(wú)錯

雖然audrey個(gè)答法比較正路

但系你個(gè)答案又比較直接同技術(shù)性

點(diǎn)選好呢? 一于交付投票啦!

As follows~~~ As follows~~~ 圖片參考：i182.photobucket/albums/x4/A_Hepburn_1990/A_Hepburn01Mar192036?t=1205930228

參考: Myself~~~

f(x)=1/9xe^(-x/3) for x>0 the expected water consumption of water for any given day =∫x[1/9xe^(-x/3)] dx [from 0 to infinity] ==∫1/9x^2e^(-x/3) dx =(1/9) Gamma[3]/(1/3)^3 =(1/9)(2)(27) =54/9 =6 我明天再正式報答啦﹐因為無(wú)手機認證﹐今日已經(jīng)用盡quota 2008-03-20 09:54:40 補充： f(x)=1/9xe^(-x/3) for x>0 the expected water consumption of water for any given day =∫x[1/9xe^(-x/3)] dx [from 0 to infinity] ==∫1/9x^2e^(-x/3) dx =(1/9) Gamma[3]/(1/3)^3 =(1/9)(2)(27) =54/9 =6 2008-03-20 10:00:09 補充： 當然Audrey Hepburn沒(méi)做錯﹐不過(guò)可惜中六七沒(méi)教Gamma distribution﹐所以用了2次integration by parts。不過(guò)我覺(jué)得朋友你一定識(因為你之前問(wèn)過(guò)些好深的統計題)﹐所以用了些快方法答啦(而且條題目是精算題?) 我說(shuō)過(guò)補答啦﹐所以我一定要「言出必行」啦