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(PECL stats >= 1.0.0)
stats_standard_deviation — Returns the standard deviation
$a
[, bool $sample = false
] )
aThe 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 the standard deviation on success; false on failure.
Raises an E_WARNING when there are fewer than 2 values in
a.