Students get helps at Stanford dervice office. Students' interrival times have exponential distribution with mean 1.5 min. there are 5 service counters in operations. each counter's service has exponential distribution with mean 6 min per student.
Determine what is the probability that the waiting line has less than two students?
Note: this question is under queue-ing theory " simulation systems" and the model of this question is (M/M/5/infinite)