A new customer walks into SLC Barber Shop every 60 minutes on average, with a standard deviation

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Question:

A new customer walks into SLC Barber Shop every 60 minutes on average, with a standard deviation of the interarrival times being 60 minutes. At SLC Barber Shop, the average service time is 30 minutes, with a standard deviation of service times being 45 minutes.
What is the capacity of the process in [customer/min]? What is the CVp?