14. When standardizing the solution of Na2S2O3 according to the sample of K2Cr2O7 for titration of i2, which was released during the interaction of an aliquot of the sample of K2Cr2O7 with KI in an acidic medium, 12.45; 12.75; 12.80; 12.90; 12.70 cm3 of Na2S2O3 solution. Evaluate the results of titration by Q-criterion. Calculate the bounds on the confidence interval for the average volume of Na2S2O3.

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