What is a standard? Does it's value count in determining the number of significant digits in the answer?

The standard deviation is a measure of the dispersion of a series of data

Result = x_{average} ± σ

Explanation:

The standard deviation is a measure of the dispersion of a series of data, it is generally used when a series of measurements of some parameters are made and it is desired to take into account the statistical fluctuations of these measurements, its formula is

where N is the number of measurements

This is a measure equivalent to the absolute error in a single measurement.

Therefore, the number of decimal places in a result must not be greater than the standard deviation.

         Result = x_{average} ± σ

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.