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  4. A physicist petfornis an experiment and takes 200 readings. He repeats the same experiment and now takes 800 readings. By doing so

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Q. A physicist petfornis an experiment and takes 200 readings. He repeats the same experiment and now takes 800 readings. By doing so

Physical World, Units and Measurements

Solution:

Correct answer is (d) the probable error is reduced by a factor 1/4