它并不是随机变动，而是有目的地移动。
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.
是x的连续型随机变量的概率分布。
研究任意随机变量序列的强收敛性。
The strong convergence of the arbitrary stochastic sequences is studied.
随机变量是一个根据概率分布取值的函数。
A random variable is a function that takes values based on a probability distribution.
生物网络的建立是用来适应各种随机变化的。
毛竹林土壤养分的结构性变异大于随机变异。
The structure variance of soil nutrient is bigger than the random variance.
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.
为了理解这一点，让我们定义以下随机变量：。
To understand this, let us define the following random variable:.
对于这个随机变量X，可能的取值个数是无限的。
I have it down that there might be an infinite number of possible values for the random variable x.
时间序列数据是以时间为指标的一个随机变量序列。
A time series data set is a sequence of random variables indexed by time.
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.
当我们看到这些数字，我们指的是观察一个随机变量。
When we observe one of these Numbers, we refer to the observation as a random variable.
然而，当利率是随机变量时，目前的研究成果并不多见。
However, when the interest rate being stochastic, these are not more.
因而，是随机变量X的范围和是随机变量Y的范围等等。
Thus is the range of random variable X and is the range of random variable Y and so forth.
我们经常在金融学中假设随机变量，比如回报，是正态分布的。
We often assume in finance that random variables, such as returns, are normally distributed.
金融学中我们常假设随机变量,例如收益率,是服从正态分布的
We often assume in finance that random variables, such as returns,are normally distributed.
合并双亲的DNA，对合并后的DNA应用随机变异以模拟繁衍。
Merging the parents' DNA, and then applying a random mutation to the merged DNA simulates procreation.
在传统的系统可靠性的研究中，系统和各部件的寿命都看作随机变量。
In classical reliability theory, the lifetimes of systems and components have been assumed to be random variables.
介绍了用古典概率和随机变量的数字特征来解决数学分析中的一些恒等式问题。
This paper introduces the problems of some identical equation solved by the numerical characters of the classic probability and stochastic variable.
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.
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.
这种假设解释了在一段时间内表型性状的随机变异，但没有解释表型性状为什么会进化。
This assumption explains the random variation of phenotypic traits over time, but it doesn't explain why phenotypic traits evolve.
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.
不论我们前面是怎样的随机变量，不论未来有多大的方差，相信波谷过了，波峰还会远吗？
No matter how ahead of us is the random variables, no matter how the variance of future, believe the trough, wave be far behind?
所以任务持续时间不是一个单一的实数，而是描述一定时间范围内完成的可能性的随机变量。
So the task duration is not a single real number, rather it is a random variable that describes the likelihood of completion within a certain range of time.
通常你要分配的每个实例化代表着不相关的随机变量，这就意味着你应该为每一个新的引擎。
Usually you want every instantiation of a distribution to represent an uncorrelated stochastic variable, which means that you should a new engine for each one.
通常你要分配的每个实例化代表着不相关的随机变量，这就意味着你应该为每一个新的引擎。
Usually you want every instantiation of a distribution to represent an uncorrelated stochastic variable, which means that you should a new engine for each one.
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