A queueing study in a department store reveal the following information about the percent of idleness and

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A queueing study in a department store reveal the following information about the percent of idleness and customer waiting time as a function of the of the number of cashiers:

The store manager wants to keep the average waiting time below 5 minutes and simultaneously maintain the percentage of idleness to below 15%. Is this goal achievable with the present data? Explain.

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