13. BROBABLE ERROR. The following values were determined in series of rod readings made under identical conditions: 3.312, 3.307, 3.304, 3.312, 3.306, and 3.313 meters. most probable value of the .observed rod readings, probable a 3.306, 3.309, 3.301, 3.311, 3,308, Determine the following: error of relative precision of a single measurement and of the mean. a single me asurement and of the mean, and the

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