In a volumetric determination of an analyte A, the data obtained and their standard deviations are as follows:

From the data, find the coefficient of variation of the final result for the % A that is obtained by using the equation that follows and assuming there is no uncertainty in the equivalent mass.
% A = titrant volume x equivalent mass x 100%/sample mass

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Initial buret reading Final buret reading Sample mass 0.19 mL 9.26 mL 45.0 mg 0.02 mL 0.03 mL 0.2 mg