Problem $2$:

to a full availability group in a delay system consisting of $30$ devices is offered a traffic with the calling rate $700$ calls$/$hour and the mean holding time $108sec.$ Supposing the assumptions for the Erlang distribution for delay systems to be fulfilled, calculate

a$)$ The traffic offered.

b$)$ The probability of delay.

c$)$ The traffic handled.

d$)$ The mean of the traffic handled per device.

e$)$ The mean waiting time for all calls.

f$)$ The mean waiting time for calls, which have to wait.