特急 。 帮忙翻译一段话，150分

为探求此排队系统的规律，首先需确定顾客流在一定时间内到达的概率分布函数．为此，一般是通过样本，算出均值，方差等数值，对照有关统计分布函数的各项数值，确定某一分布函数．根据我们调查获得的数据，抵达淮安支行的顾客流量大体上服从Poisson分布。
To explore the rule of queue system to determine the flow of customer first, in a certain time within the probability distribution function. Therefore, usually through the sample, calculate the mean and variance of numerical control etc, the relevant statistical distribution function, determine a distribution function. According to our survey data obtained in huaian, the customer to flow in subbranch Poisson distribution.