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A single observation, such as 50486055535157526145 cannot have a standard deviation cube test compressive result.
You cannot calculate standard deviation for objects such as concrete cubes - you can only calculate standard deviation for some measure - such as side length, surface area, volume, mass, alkalinity or some other measure.
it is in arithmetic
Square the standard deviation and you will have the variance.
You need more than one number to calculate a standard deviation, so 9 does not have a standard deviation.