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Customers send emails to a help desk of an online retailer every 2.9 minutes, on...

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Accounting

Customers send emails to a help desk of an online retailer every 2.9 minutes, on average, and the standard deviation of the interarrival time is 90 seconds. The online retailer has three employees answering emails. It takes on average 7.5 minutes to write a response email. The standard deviation of the service times is 3.5 minutes. How many emails would there be, on average, that have been submitted to the online retailer, but their senders have not received the response email yet?

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