Solve the following problem The library loan counter receives 10 book loans per hour, and it is presumed that the counter can issue a rate of 12 book loans per hour. Find 1) The probability that the reference desk is busy 2) The probability that the reference desk is NOT busy 3) What is the average number of loans that will be waiting for service (hint: as in queue)? 4) What is average waiting time for a book loan in the library (hint: as in the system)