Shares of Perrigo (PRGO) have gained 2.9% over the past four weeks to close the last trading session at $27.09, but there ...

When you have the average production of three machines, it is easy to calculate the average or mean production. You just add ...

You should think about starting with Vanguard Extended Market Index Admiral (VEXAX). VEXAX has no Zacks Mutual Fund Rank, but we have been able to look into other metrics like performance, volatility, ...

Any investors hoping to find an Allocation Balanced fund might consider looking past Franklin Corefolio Allocation A (FTCOX). FTCOX bears a Zacks Mutual Fund Rank of 4 (Sell), which is based on ...

Standard deviation is a readily available and easily understood statistic that measures how often an event strays from the norm. Think of two amusement park rides.

The standard deviation is a formal measure of the tendency of the numbers in your list to vary – or deviate – from the mean. You can think of it as a measure of how "spread out" your numbers are.

Standard deviation is a common statistical measurement and is defined by Oxford Dictionaries as: ‘A quantity expressing by how much the members of a group differ from the mean value for the ...

Bitcoin has surged 12% in the past month to new all-time highs at $122,000, but data indicates that the BTC peak is not in ...

Standard deviation only measures stability, relative to the recent past, not expected future performance. To understand the shortcomings of this approach, look at the Bloomberg Aggregate Bond Index.