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Standard deviation for a single point?

I have 6 points of data and the standard deviation for those 6 points is 1450934. What is the standard deviation for a single point though?

Sample standard deviation is undefined for a single point, as it involves dividing by a factor of n - 1, where n is the sample size.

However, ordinary (population) standard deviation for a single point is always zero, since there is no deviation from the mean (the value of the point is equal to the mean of the single point).

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SINGLE POINT THREAD CUTTING ON A MANUAL LATHE