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Mean response time vs Mean turnaround time

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I'm confused about the meaning and usage of response time and turnaround time. As far as I know, response time is the time between the arrival of a task until the first response (first step to execute the task) and the turnaround time is the time between arrival of a task to the completion of the task execution, but I found this formula for average response time in several research paper [1] and [2]:

ART = 1/N ∑ (Finish_Time - Arrival_Time)

Arrival_Time is when a task arrives and Finish_time is when the task leaves the system.

Does this formula represent Average response time or average turnaround time?

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