Question: At a post office, customers arrive at an average rate of 38 customers per hour following a Poisson distribution. The average service rate per clerk

At a post office, customers arrive at an average rate of 38 customers per hour following a Poisson distribution. The average service rate per clerk is 20 customers per hour (assume Exponential distribution).

If a clerk is paid $30 per hour while customer waiting is estimated at $20, what is the optimal number of servers

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