1. CPU-on-Demand (CPUD) offers real-time high-performance computing services. CPUD owns 1 supercomputer that can be accessed through the Internet. Their customers send jobs that arrive on average every 5 hours. The standard deviation of the interarrival times is 5 hours. Executing each job takes on average 3 hours on the supercomputer and the standard deviation of the processing time is 4.5 hours.how long does the customer have to wait to have the job completed?

2. The organizers of a conference in houston convention center are evaluating the possibility of setting up a computer area where attendees can check their email on computers provided by the organization. there will be 1 common queue for all computers and only one person uses a computer at a time. on average there are 16 atendee arrivals per hour and the average time a person spends on the computer is 9 minutes. to insure that waiting times are not to long, the organizers want to ensure that the utilization of the computers doesnt exceed 90 percent. at least how many computers do they need to have?