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13 <br /> Performance Standards — Sales Ratio <br /> • Median Sales Ratio is found by ordering all ratios from <br /> highest to lowest and selecting the middle value, which <br /> reduces the impact of outliers. <br /> • The mean sales ratio is the average of the dataset of sales <br /> ratios. <br /> • Median sales ratio is more widely used than the mean sales <br /> ratio and the standard provided by NCDOR. <br /> ORANGE COUNTY <br /> 11 NORTH CAROLINA <br />