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MIL-D-70789A (AR)
6.8.2.4 Probable error (PE). PE is the equally likely
deviation (50% probability) of a set of linear measurements about
the true (reference) value. PE shall be-computed as:
PE = 0.6745 X RMSX
6.8.2.5  Standard deviation about the mean. The Standard
Deviation about the Mean (o) is the measurement of the dispersion
of the measurements in a sample about the arithmetic mean.
shall be computed as:
Where:
N is the total number of measurements in the sample.
m1 is the i'th measurement in the sample.
m is the arithmetic mean of the sample.
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