Question: A workshop operates 10 hours per day and processes an average of 15 customer orders per day. Order interarrival time follows an Exponential distribution. Service

A workshop operates 10 hours per day and processes an average of 15 customer orders per day. Order interarrival time follows an Exponential distribution. Service time to complete an order is uniformly distributed between 20 and 50 minutes. Find the mean and variance of the number of orders (N) in the workshop?

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