The distance Thursday: is the distance the service quality of the company. The quality of service was considered to be perfect when the distance Thursday by 0.
distance Thursday was the quality of the service of the company and this distance depends on the variability of the gap 1,2,3, and 4. Improve the quality of service is minimizing the gap 5, This meant that minimizes the distance remaining. Quality of service in the company identified by the function:
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