Standard deviation is a basic statistic that represents the degree of dispersion in data. It tells us 'how spread out the ...

Standard deviation is a metric that shows the variability of a security’s returns over time. It can be used to gauge volatility based on past performance and compare a future return to past returns.

IQ 100 is the benchmark value set as the "average" in most intelligence tests. In terms of ranking, it is exactly in the middle of the group, and in terms of percentile, it corresponds to the top 50%.

Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Andy Smith is a Certified Financial Planner ...