80 Решение задачки по химии №08 090

12. In three parallel samples of Mohr´s salt, the mass fraction of FeO (in %) was determined by the permanganometric method: 17.75; 17.95; 18.05. Determine the boundaries of the confidence interval of the mass fraction of FeO at a confidence level Р=0.95 and the relative error in measuring the mass fraction of FeO.

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