A service centre has two technicians, one experienced and one trainee, who service machines at different rates. It is estimated that, 70% of customers use the experienced technician and 30% use the trainee for service. The arrival rate for each minute of operation is given by the following probability distribution:

No. of arrivals per hour of operation	Probability
0	0.10
1	0.20
2	0.35
3	0.30
4	0.05

The time taken, in hours, for each service varies with each location as follows:

Experienced		Trainee
Service Time	Probability	Service Time	Probability
2	0.10	3	0.20
3	0.20	4	0.30
4	0.60	5	0.35
5	0.10	6	0.10
		7	0.05

Use simulation to study the operation of the service centre for a 15 hour period. Fully analyse all your results. Comment on simulation as a means of assessing such problems.

Random numbers: 20 18 94 83 27 56 49 83 17 74 26 75