随机变量，如上例中的时间，与一些特性相关，这些特性不同于那些与单个值相关的特性。
A random variable, such as time in the example above, is associated with properties that are different from those associated with a single value.
在数学术语中，不完全确定的值称为随机变量。
In mathematical terms, values that are not known with complete certainty are called random variables.
随机变量的方差衡量随机变量值与期望值偏离的程度。
The variance of a random variable measures how far from the expected value its values typically are.
随机变量的加权平均值是期望值。
The weighted mean of the random variable is the expected value.
取代单个值，随机变量拥有描述估计值可能性的函数，该函数称为变量的概率分布。
Instead of this single value, a random variable has a function that describes the likelihood of values for the estimate and is called the variable's probability distribution.
并可以对分布的变量随机产生的值进行统计。
And distribution of the variables can be randomly generated statistical value.
3方差的专业定义是随机变量的二次中心矩，与期望值之差的平方的加权平均值。
The technical definition of variance is the random variable's second central moment, the weighted average of the square of the differences from the expected value.
主要讨论了一类随机规划在函数序列上图收敛和随机变量序列均方收敛意义下，该类随机规划的最优解和最优值的收敛情况。
The convergence of the optimal value and optimal solution of the stochastic programming are given as the function sequence is epi-convergence and the random variable sequence is square convergence.
变异的真正的变量意味着随机创建的值被添加到变量的低概率。
Mutation of real variables means that randomly created values are added to the variables with a low probability.
研究用混合泊松随机变量的观察值来估计其随机强度的问题。
This paper studies estimation of stochastic intensity from observed values of mixed Poisson random variables.
为求出随机特征对的方差，借助于模态截断概念推出诸特征值与特征向量对随机变量的偏导数。
Partial derivatives of eigenvalues and eigen vectors with respect to random variables for structures are deduced by means of the concept of mode truncation.
本文讨论了系统的最优维修策略问题，考虑到题目中所涉及的变量大多为随机变量，我们建立了单目标的期望值模型。
Optimal maintenance policy problem in a system is discussed and analysed in this paper. Due to the random variable concerned, one objective mathematical model of expectation value is developed.
同时，分析了储油罐震害预测中影响较大的随机性因素，并建议了主要随机变量的概率模型和统计特征值的选取方法。
The most important random factors in the earthquake disaster prediction is analyzed, the probabilistic model and statistical characteristic value of the primary random variables are also put forward.
图像的灰度值可以看作是一区域化变量，不仅具有随机性，而且具有空间结构性。
The grey value of image can be treated as regionalized variable, which has the property of both random and spatial structure distribution.
集值随机变量与集值随机过程作为一个新兴的研究领域，无论在理论上还是实际应用上面都不太成熟，不够完善，需要进一步的探索与开发。
As a new and developing research field, Set-valued variable and Set-valued stochastic process is not perfect both in theory and practical application, and need to be further explored and developed.
提出了基于可信性理论的运行风险评估算法，采用随机模糊变量的期望值表示全系统的运行风险指标。
Based on the credibility theory, an algorithm for random fuzzy operational risk assessment is proposed, and power system operating risk is expressed by a random fuzzy expected value.
本文通过大量的试验、调查分析，得到了组成铁路桥梁永久作用各分随机变量的统计特征值，并进一步分别得到了钢桥、混凝土桥桥上永久作用的概率分布。
In this paper the probability distribution curve of the dead Loads acting on railway Bridges is obtained through a great number of experiments, investigations and analyses.
利用振型迭加法导出了结构物理参数和作用荷载幅值同时具有随机性时结构动力响应随机变量的数字特征计算表达式，并提出了求解方法。
The randomness of both physical parameters of structure and the amplitude peak of applied load are taken into account in the present model.
概率分布是描述随机变量取某个特定的值或取某一区间范围内值的概率。
The probability distribution associated with the random variable X describes the likelihood of obtaining certain values or ranges of values of the random variable.
概率分布是描述随机变量取某个特定的值或取某一区间范围内值的概率。
The probability distribution associated with the random variable X describes the likelihood of obtaining certain values or ranges of values of the random variable.
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