To determine the concentration of iron in an unknown sample, a chemist analyzed the sample five times and obtained the following results: 410.34 ppm, 424.03 ppm, 340.49 ppm, 112.05 ppm, and 207.96 ppm. If the accepted literature value for the concentration of iron in this sample is 405.35 ppm, determine the percent error for this set of analyses.

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