Gubser Welding, Inc., operates a welding service for construction and automotive repair jobs. Assume that the arrival of jobs at the company's office can be described by a Poisson probability distribution with an arrival rate of two jobs per 8-hour day. The time required to complete the jobs follows a normal probability distribution, with a mean time of 3.0 hours and a standard deviation of 2.1 hours. Answer the following questions, assuming that Gubser uses one welder to complete all jobs.
What is the mean service rate in jobs per hour? (Round your answer to four decimal places.)