please use precise calculations

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 6 hours. The standard deviation of the interarrival times is 4 hours Executing eachjob takes on average, 3 hours on the supercomputer and the standard deviation of the processing time is 40 hours Answer is complete but not entirely correct. (Do not round intermediate calculations Round your answer to 1 decimal place.) How long does a customer have to wait to have a job completed? 5.6 hours HINT: the amount of time the customer waits for the job to come back includes the waiting time of the job and the processing time of the job