So by the definition we have mean, m and standard deviation, s.
So the upper limit is m+ 3 s = 0.39483 + 3* 0.00011 = 0.39516
So the lower limit is m+ 3 s = 0.39483 – 3* 0.00011 = 0.39450
Hence the natural tolerance is 0.39450 to 0.39516
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