31. Решение задачи по химии №003 106

When determining the mass fraction of TiO2 in the mineral by the photometric method for four parallel samples of the mineral, the following analysis results were obtained: 8.40; 8.25; 8.32; 8.46%. calculate the confidence limits of the average value of the mass fraction of TiO2 at Р=0.95 and the relative error of the analysis

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