1、random variable

random variable發(fā)音

英：　　美：

random variable中文意思翻譯

常用釋義：隨機(jī)變量：在統(tǒng)計(jì)實(shí)驗(yàn)中

隨機(jī)變量，隨機(jī)變數(shù)，無(wú)規(guī)變數(shù)

[數(shù)]隨機(jī)變數(shù)，[數(shù)]隨機(jī)變量；無(wú)規(guī)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(xù)型隨機(jī)變量的函數(shù)還是連續(xù)型隨機(jī)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(shù)據(jù)的標(biāo)準(zhǔn)差.

3、The weighted mean of the random variable is the expected value.───隨機(jī)變量的加權(quán)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(jù)概率分布取值的函數(shù)。

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(yīng)用copula函數(shù)來(lái)研究隨機(jī)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(duì)于這個(gè)隨機(jī)變量X，可能的取值個(gè)數(shù)是無(wú)限的。

7、Firstly, the definitions of complex quasi - random variable and primary norm are introduced.───引入復(fù)擬(概率)隨機(jī)變量, 準(zhǔn)范數(shù)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(duì)稱(chēng)隨機(jī)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(xiǎn)X的視為依賴(lài)于一參數(shù)的隨機(jī)變量.

10、Based on random variable expectation and variance, some inequalities are proved.───基于隨機(jī)變量的數(shù)學(xué)期望與方差, 討論隨機(jī)變量數(shù)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(yīng)變量

2、dummy variable───[數(shù)]啞變量；名義變數(shù)；虛變數(shù)

3、random variables───隨機(jī)變量；隨機(jī)變數(shù)

4、response variables───反應(yīng)變數(shù)

5、dependent variable───因變量；他變數(shù)；[數(shù)]應(yīng)變數(shù)

6、random rubble───亂砌毛石

7、random sample───[數(shù)]隨機(jī)樣本；隨意抽取調(diào)查；[天]隨機(jī)樣品

2、Expected value for continuous random variable

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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(bào)答啦﹐因?yàn)闊o(wú)手機(jī)認(rèn)證﹐今日已經(jīng)用盡quota 2008-03-20 09:54:40 補(bǔ)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(bǔ)充： 當(dāng)然Audrey Hepburn沒(méi)做錯(cuò)﹐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(shí)(因?yàn)槟阒皢?wèn)過(guò)些好深的統(tǒng)計(jì)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(bǔ)答啦﹐所以我一定要「言出必行」啦