89 Решение задачки по химии №08 951

According to the results of potentiometric titration in four parallel samples of steel, the mass fraction of chromium was determined: 7.70; 7.84; 7.65; 7.65. Find the boundaries of the confidence interval of the average value of the mass fraction of chromium in steel (P = 0.95) and the relative error of the analysis

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