... t t ≥ 0 （ ＞ 0） 0 t ＜ 0 F（t）= E（X）= 1/ Var（X）= 1/ 2 30 3、正态分布模型（normal distribution model） 这种分布是概率统计的理论与应用中最重要的一种分布。
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logarithm normal distribution model 对数正态分布模型
multivariate normal distribution model 多元正态模型
Truncated mixed normal distribution model 截取混合正态分布模型
As the dataset is not in a symmetrical shape, we can clearly rule out that a normal distribution model would not be a suitable choice.
由于数据集不是对称的，我们可以清楚地排除正态分布模型不是一个合适的选择。
Results Mix normal distribution model with four normal variables was fitted by the training sample.
结果由训练样本拟合得到四元混合正态模型；
It was found that the reaction rate submitted normal distribution with reaction time and a normal distribution model was proposed to fit the kinetics data.
与随机孔模型对比，发现正态分布时间模型能较好地描述煤焦的气化动力学规律。
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