mathematic expectation

Based on the normal distribution , deduces the probability density distributions of pipe flow and node pressure and the numerical features such as mathematic expectation and variance .

基于正态分布导出了管网中管段流量和节点压力的概率密度分布和数学期望、方差等数字特征。

The thesis sets up the ready-made flour-product sale profit model by putting forward the conditions on which the maximum mathematic expectation of profit is based .

讨论面点销售利润的模型，提出了获利数学期望最大值的条件，并在此基础上进一步讨论了损失费用的最小值，为销售商的营销策略提供一定的借鉴。

Mathematical expectation is important concept of probability theory , to apply mathematic expectation discuss economic problems , and obtain useful conclusions .

数学期望是概率论的一个重要概念，应用数学期望讨论某些经济问题，从而得到一些有意义的结论。

The fire intensity model is built by the mathematic expectation that the forces that are arrayed in given distribution density attack the saturation air attack forces in a minute .

火力强度模型则通过以特定兵力密度分布在本区一分钟内抗击饱和进袭的敌空袭兵器的数学期望值建立。

Random Process theory has proved that when the degree of confidence is fixed , confidence interval length of mathematic expectation is inversely proportional to the square roots of sample points .

随机过程理论证明：在置信度一定的情况下，数学期望的置信区间长度与样点数呈平方根反比关系。

By calculating the mathematic expectation and standard deviation of the temporal estimations , the stochastic errors and bias errors of the first and second order statistical moments of the sample process are obtained in close-form .

运用概率论的计算方法，推导出了上述随机变量或过程的前二阶矩的解析表达式，得到了模拟风场的统计特征时域估计的偏度误差和随机误差。

Markov chain monte carlo simulation ( MCMC ) was taken to sample the posterior distribution to get the marginal posterior probability function of the parameters , and the statistical quantities such as the mathematic expectation were calculated .

通过马尔科夫链蒙特卡罗模拟对后验分布进行了采样，获得了参数的后验边缘概率密度，并在此基础上获得了参数的数学期望等统计量。

The establishment of fire spread model , determination of mathematic expectation and square deviation of building fire loss rate , and establishment of fire spread model for typical combustible material and statistical method for the load of typical building fire are put forward .

提出建立火蔓延模型，确定建筑物火灾损失率的数学期望和方差，建立典型可燃物火蔓延模型与典型建筑火灾荷载统计方法；

By using the cloud model , this paper maps the indefinite comment as different cloud droplets with fine variations , and maps the variation of each factor 's weight as correctable mathematic expectation of the cloud , and thus puts forward a comprehensive evaluation model based on cloude model .

文章利用云模型把不确定的评语映射为可细微变化的不同云滴，把各因素权重的变化映射为可修正的云的数学期望，提出了基于云模型的综合评判模型。