To 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.4  3. Then work out the mean of those squared differences.5  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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1 Foreign direct investment (FDI) refers to long-term capital investment, such as the purchase or construction of machinery, buildings, or whole manufacturing plants. 2  If foreigners are investing in a country, that represents an inbound flow and counts as a surplus item on the capital account.or the accountancy use of the term, see Capital account (financial accounting) . In macroeconomics and international finance, the capital account (also known as the financial account) is one of two primary components of the balance of payments, the other being the current account.