抄録
In succession to the previous paper, a method to calculate the waiting time and the member of the queue are investigated with the formulae by Pollazeck-Hinchin, computing the variance and the mean of the service time distribution with a single channel for the case when each function of a convertible facility has duplicated service time with Erlang distribution (including exponential and constant service time). This is available for any case when arrivals come out exponential, not confinded to estimating the scale of facilities with convertibility (that is, to be used in two or more ways or purposes). If the purpose of the facility is single, it is possible to calculate the queue or waiting time when the feature of the users can be described as a combination of some distributions of using time (in the case of Poisson arrival as a whole), such ss, speaking of its application to buildings, estimation of scales of a common waiting room with various distribution of using time, utilization of an operating room with various time distribution of operation according to diseases' or estimation of scale of a parking space taking into account the characters of the environs. (Same is the case of plural channels.)
