Can someone please help me understand how to get this answer? During calibration

Question

Can someone please help me understand how to get this answer?

During calibration, the following values are determined for a sensor: Zero order uncertainty = 0.30 mm Repeatability error = 0.33 mm The measurements taken during the experiment show an uncertainty of: Experiment uncertainty = 0.52 mm What is the overall uncertainty of the experimental result? [Assume 30 measurements were taken both in the calibration, and in the experiment. Review your experiment 1 calculations for a hint. Use a 68% uncertainty level to express your answer to this question. Assume all given uncertainties are at the 68% level] What is the overall instrument uncertainty? 0.2100 0.32

Explanation / Answer

Zero order uncertainty is 0.30

Repeatedly error is 0.33

Experiment uncertainty is 0.52

Here we need to use only 68% uncertainty level so

68%of 0.52 = 0.35

If we take average of all which will be equals to

(0.35+0.30+0.33)/3

=O.32 margin error of +/- 0.01

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