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- DictionaryStand·ard de·vi·a·tion/ˈstandərd ˌdēvēˈāSHən/
noun
- 1. a quantity calculated to indicate the extent of deviation for a group as a whole.
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noun
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In statistics, the standard deviation is a measure of the amount of variation of a random variable expected about its mean. A low standard deviation indicates that the values tend to be close to the mean (also called the expected value) of the set, while a high standard deviation indicates that the values are spread out over a wider range. The standard deviation is commonly used in the determinati... Wikipedia