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.
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Ladda Tammy Duckworth is an American politician and retired U.S. Army Lieutenant Colonel, serving as the junior United States Senator for Illinois since 2017. A member of the Democratic Party, she earlier represented Illinois' 8th district for two terms in the United States House of Representatives. Before election to office, she served as Assistant Secretary for Public and Intergovernmental Affairs in the United States Department of Veterans Affairs, and she was the Director of the Illinois Dep