Standard deviation helps business understand the research they have done on their potential customers. If the information deviates by one, then they know that they can rely on the information more so than research that deviates to standards deviations away from the mean.
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Because the z-score table, which is heavily related to standard deviation, is only applicable to normal distributions.
What_is_the_relevance_of_standard_deviation_in_business
The standard deviation of the population. the standard deviation of the population.
The standard deviation is 0.
The standard deviation in a standard normal distribution is 1.