filadendron / Getty Images Standard deviation ... difference between each point within the data set and the mean. Once you figure that out, square and average the results. Using software like ...

Using Microsoft Excel ... taking the difference between the mean and population mean and dividing it over the standard deviation divided by the degrees of freedom square root. For example, if ...

You probably knew that Microsoft's Excel ... the difference between the current price and the entry price, the percent return, the profit and loss, and the overall standard deviation.

You also knew the differences between ... values for the standard deviation. An awareness of the standard deviation can be important in many different business contexts. For example, if you ...