6. Find the root mean square error of a single determination (S), the root mean square error of the arithmetic mean (Sx) and the relative root mean square error of the arithmetic mean (Sхr) in%, as well as the confidence interval at a confidence level P=0.95 for a number of polarographic determinations of content cadmium: 0.71; 0.72; 0.73; 0.74%.

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