To calculate the standard deviation of those numbers: 1  1. 2  2. Then for each number: subtract the Mean and square the result. 3  3. Then work out the mean of those squared differences. 4  4. Take the square root of that and we are done!o calculate the standard deviation of those numbers: 1  1. 2  Work out the Mean (the simple average of the numbers). 3  2. Then for each number: subtract the Mean and square the result.
FBI-Law Enforcement Executive Development Association is a private 501 (c)(3) nonprofit organization and is not a part of the Federal Bureau of Investigation or acting on behalf of the FBI.
What does the National Institute on Drug Abuse (NIDA) do? NIDA is a federal scientific research institute under the National Institutes of Health, U.S. Department of Health and Human Services. NIDA is the largest supporter of the world's research on drug use and addiction.