Question: please hlep me with the solution with written format Customers arrive to a rural bank on average every 12 minutes. Their arrivals follow a Poisson

please hlep me with the solution with written format

Customers arrive to a rural bank on average every 12 minutes. Their arrivals follow a Poisson arrival process. The time taken to serve each customer may be assumed to follow an exponential distribution with a mean time of 8 minutes. Customers walt in a single queue to get their baking done and no customer leaves without service Calculate the probabilty a customer will spend more than 30 minutes at the bank (time in queue plus service time)

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