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Recently, the manager at Micron conducted a study of the time customers spent on hold waiting for a Micron representative to become available

Statistics Sep 17, 2020

Recently, the manager at Micron conducted a study of the time customers spent on hold waiting for a Micron representative to become available. The data showed that the distribution of time spent on hold is approximately normally distributed, with a mean of 18 minutes and a standard deviation of 4 minutes.

Question: The service manager wants to make sure that no one waits longer than 18 minutes. Determine the standard deviation that would be required to meet this goal?

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