(b) A tax consulting firm has 5 counters in its office to receive people who have problemsconcerning their income, wealth and sales taxes. On the average 75 persons arrive in an 8–hour day. Each tax adviser spends 25 minutes on an average on an arrival. If the arrivalsare Poissonly distributed and service times are according to exponential distribution, findi. The probability of there being no customer in the system ii. The average number of customers in the system iii. Average number of customers waiting to be served