(PECL stats >= 1.0.0)
Returns the standard deviation
float stats_standard_deviation ( array $a [, bool $sample = false ] )
Parameters:
a
The array of data to find the standard deviation for. Note that all values of the array will be cast to float.
sample
Indicates if a represents a sample of the population; defaults to FALSE.
Returns:
Returns the standard deviation on success; FALSE on failure.
Exception:
Raises an E_WARNING when there are fewer than 2 values in a.
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