standard normal density function

例句：

1. 1. The standard normal distribution function is used to describe the probability of a random variable being greater thanor equal to a certain value.
   标准正态分布函数用于描述随机变量大于或等于某一特定值的概率。
2. 2.In statistics, the standard normal distribution function is used to calculate the mean and standard deviation of a sample.
   在统计学中，标准正态分布函数用于计算样本的均值和标准差。
3. 3. The standard normal distribution function is used in many areas of science and engineering, such as finance and engineering, to model the behavior of complex systems.
   标准正态分布函数在许多科学和工程领域得到广泛应用，如金融和工程，用于模拟复杂系统的行为。