Then he tried calculating the average standard deviation by doing the same thing. He added the three standard deviations and ...

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Step 4: Calculate standard deviation of the returns using the STDEV function. Note: The average and standard deviation are expressed as percentages, while the variance is a decimal number.

Steps to calculate standard deviation. If you break down the equation step-by-step, you'll find it's not too difficult to calculate on your own. As an example of a standard deviation calculation, ...

For example, if the range of data is in cells A2 through A13, type "=STDEV(A2:A13)" to calculate standard deviation. Advertisement. Article continues below this ad. More For You.

For example, if your mean is in cell A2, population mean in cell B2, standard deviation in cell C2, square root of degrees of freedom in E2, type the formula as =(A2-B2)/(C2/E2) to generate the T ...

Use Excel to calculate standard deviation. After entering your data, use the STDEV.S formula if your data set is numeric or the STDEVA when you want to include text or logical values.

The variance is needed to calculate the standard deviation. These numbers help traders and investors determine the volatility of an investment and allow them to make educated trading decisions.