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 ...

Though there isn't a short cut to calculating standard deviation, you can estimate the degree of standard deviation visually. If the shape of a distribution of data points is relatively skinny ...

You can calculate standard deviation of an asset in a spreadsheet ... annualized volatility of the index is 10.39% based on the sample data. If you want to know the asset's weekly volatility ...