The sea view resort uses a multiple channel..

The Sea View Resort uses a multiple-channel queue registrationsystem. If the average service time is 8 minutes, there are three registration clerks, and guests arrive at the rate of one every 5 minutes, find
a. ? and ?.b. the probability all three clerks are idle.c. the probability a guest will have to wait.d. the average time a customer is in line.e. the average number of customers in line.