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How is the standard deviation of returns for individual common stocks or for a stock portfolio...

How is the standard deviation of returns for individual common stocks or for a stock portfolio calculated?

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Standard Deviation of returns of stock is calculated by calculating sum of square of deviation of the returns from the average.
Standard Deviation Deviation of individual stocks = ((\sumReturni -Averagei)^2/(n-1))^0.5, where n be the number of stocks.
Standard Deviation o Portfolio is calculated as follows.
Standard Deviation of Portfolio =   (( Weight of A* Standard Deviation of A)2 + ( Weight of B* Standard Deviation of B)2 +2 * Weight of A* Weight of B* Standard Deviation of A * Standard Deviation of B* Correlation coefficient)0.5

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