Jobs arrive at processing station A according to a Poisson process with rate 1 per minute. If the single server is busy, they wait for the single server to become available. After service, with...

Extracted text: Jobs arrive at processing station A according to a Poisson process with rate 1 per minute. If the single server is busy, they wait for the single server to become available. After service, with probability 1/2 the job departs the system; otherwise it moves on to station B, which operates like station A except that after service all jobs depart the system. The service times are independent and exponentially distributed with mean 1/2 minute at each of the stations. What is the average number of jobs at station B (waiting or in service)? Type your answer.