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Uncertainties (resistivity experiment) Watch

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    We measured the uncertainty of measuring the diameter of the wire using a micrometer. We took three readings at 0.119, 0.119 and 0.121mm meaning that the mean is 0.1196666666667mm^2 . When calculating the uncertainty is it precision/lowest value, /mean or /highest value?
    Thank you in advance
 
 
 
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