Standard deviation measures how far numbers in a data set are spread out from an average value. In investing, it is used as a measurement of portfolio volatility.

When you have the average production of three machines, it is easy to calculate the average or mean production. You just add up the three means and divide by three. But what if I want the average ...

Standard deviation is a measure of how far away individual measurements tend to be from the mean value of a data ... of statistical and probabilistic formulas, most notably the normal distribution.

An animated guide explaining how the standard ... with the same mean, median and mode, samples can differ greatly. How to calculate standard deviation using the defining formula is explained.

2. Find the daily standard deviation. Now, you will use the STDEV.S function in Excel. Place your cursor in D13 and type '=STDEV.S(D4:D12)' without the quotation marks. This formula calculates the ...