Customers arrive at random at an average rate of 3 per hour at a health and wellbeing shop. The manager serves all the customers herself; she does not have any assistants. Individual service times are exponentially distributed with mean 12 minutes. (a) Write down the specification of the queue, and calculate the traffic intensity for this queue. (Assume that the patterns of arrivals and departures at the shop attain equilibrium shortly after the shop opens each day.)

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