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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President Barack Obama plans to nominate James Comey as director of the FBI, administration officials said Wednesday. Comey is a Republican and former deputy attorney general under George W. Bush. The nomination is a signal of bipartisanship from Obama, who has had difficulty seeing his nominees confirmed, and is likely to garner support from both parties in the Senate.