Abstract:
The purpose of this research was to analyze the queuing system in case study of Krungthai bank,
Tesco lotus Navanakorn branch. In this research, the study focused on the deposit, withdrawal, money
transfer, and bill payment departments which were taken by most of customers in daily life. The data
collection was from 27th August to 9th September 2018, including with 14 days. The service period was
selected from 4.30 - 7.30 p.m. because of the peak time. Moreover, in the data collection, the early month
had the waiting service problem at most. Consequently, the researchers recorded the data especially early 5
days in a month. For the result, the average arrival rate was 1.15 people/minute with the Poisson distribution.
While, the average service rate was 0.44 person/minute with the exponential distribution. There were 3
service counters which were corresponded to the M/M/3 queuing model. With using the queuing theory, the
average time which the customers had waited during in the queue was 4.51 minutes/person. In addition, the
average time which the customers had waited during in the system was 6.78 minutes/person. For this
analysis, the research can help and improve the banking service system in the peak time to satisfy with the
customers at most