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A research worker takes 100 careful readings in an experiment. If he repeats the same experiment by taking 400 reading,

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A research worker takes 100 careful readings in an experiment. If he repeats the same experiment by taking 400 reading, then by what factor will the probable error be reduced?

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By a factor of 4.

\(i.e.,[ \frac{400}{100} = 4]\)

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