Statistically, the percentage of people with an IQ of 120 or higher is approximately the top 9% of the population, or about 1 ...

"That person's work sense is about one standard deviation above average, isn't it?"Have you ever heard someone who seems ...

In statistics, the standard deviation is a measure of the amount of variation or dispersion of a set of values. A low standard deviation indicates that the values tend to be close to the mean (also ...

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 ...