During the campus spring fling, the bumper car amusement attraction has a problem with cars becoming disabled and in need or repair. repair personnel can be hired at the rate of $22 per hour. One repairer can fix cars in an average time of 25 minutes. while a care is out of service disabled the waiting to be repaired or being repaired, lost income is $42 per hours. cars tend to break down at the rate of two per hour. Assume that their is only one repair person, the arrival rate follows a Poisson distribution and the service time follows an exponential distribution.

b.

One average, how many disabled bumper care are out of serve and not able to take rides on the bumper car attraction?