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The length of a line was measured repeatedly on three different occasions and probable error of each mean value was computed with the following results:

The length of a line was measured repeatedly on three different occasions

and probable error of each mean value was computed with the following results:

1stset of measurements = 1201.50 0.02m

2ndset of measurements= 1201.45 0.04m

3rdset of measurements = 1201.62 0.05m

what are the weighted mean of the three sets of measurements?

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