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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From Wikipedia, the free encyclopedia. The Water Resources Development Act of 2007 or WRDA 2007 (Pub.L. 110â114, formerly H.R. 1495) is a United States law that reauthorized the Water Resources Development Act (WRDA), and authorized flood control, navigation, and environmental projects and studies by the United States Army Corps of Engineers.