Standard Deviation
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The standard deviation is a statistic defined as the square root of the variance that measures how spread out a set of data is.
Standard deviation is a high school-level concept that would be first encountered in a probability and statistics course. It is an Advanced Placement Statistics topic and is listed in the California State Standards for Probability and Statistics.
Prerequisites
| Arithmetic Mean: | Arithmetic mean is a synonym for average, i.e., the sum of all values in a list divided by the number of values present. |
| Variance: | In statistics, variance is the measure of the expected deviation from the mean. The square root of the variance is the standard deviation. |