Question: please explain how you get the answer I know the answer is 0.76, however, I don't understand why the arrival rate becomes 1/7 and processing

please explain how you get the answer

I know the answer is 0.76, however, I don't understand why the arrival rate becomes 1/7 and processing time becomes 1/4.

please explain how you get the answer I know the

Customers send e-mails to a help desk of an online retailer every 7 minutes, on average, and the standard deviation of the interarrival time is also 7 minutes. The online retailer has only one employee answer emails. It takes on average 4 minutes to write a response e-mail. The standard deviation of service times is also 4 minutes. The service duration has an exponential distribution and the interarrival time also has an exponential distribution. How may e-mails would there be, on average, that have been submitted to the online retailer but not yet opened by the employee? (Provide your answer as a number with decimals; do not use fractions)

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