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§2—1 常用的计算公式在运算数学模型之前,先对常用的计算公式作一简要介绍。因为随机变量的平均值(数学期望)的运算,与确定量相同,所以这里只介绍标准偏差的运算公式。标准偏差的平方即为方差。常数(C)与随机变量(ξ)乘积的方差:
§2-1 Commonly used calculation formulas Before calculating mathematical models, make a brief introduction to commonly used calculation formulas. Since the calculation of the mean (mathematical expectation) of random variables is the same as the determination, only the formula for calculating standard deviation is introduced here. The square of the standard deviation is the variance. Variance of the product of the constant (C) and the random variable (ξ):