Standard deviation: Difference between revisions

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m Undo revision 102954512 by Shaun ward (talk) rv nonsense
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all you basically need to know is that standard deviation is x+y=xy+xy
 
 
In [[probability]] and [[statistics]], the '''standard deviation''' of a [[probability distribution]], [[random variable]], or [[statistical population|population]] or [[multiset]] of values is a measure of the spread of its values. It is defined as the [[square root]] of the [[variance]].