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The amount of cadmium in a sample is determined by AAS. The standard solutions produce a straight calibration curve with a slope of 0.1024 +_0.0082 abs. units/ppm and a y-intercept of 0.0105 +_ 0.0076 abs. units. The absorbance of the unknown solution A=0.4862 +_ 0.0184 abs. units. Determine the un certainty in the concentration of the unknown.

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