stats_standard_deviation

Returns the standard deviation

float **stats_standard_deviation** array $a bool $sample

Returns the standard deviation of the values in . a

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 represents a sample of the population; defaults to false. a

Returns the standard deviation on success; false on failure.

Raises an when there are fewer than 2 values in . E_WARNING``a

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