Accordng to Gaussian distribution equation, we can paint a curve and obtain the normal distribution curve of random error and the rule of random error. According to the rule, we may get probability of random and confidence interval.

• 按高斯误差分布方程作图可得偶然误差的正态分布曲线,根据方程和曲线可得偶然误差的分布规律,可求出偶然误差出现的概率,从概率可得到平均值的置信区间。