Function stdev( values, ... )

Description:
Returns the population standard deviation of the non-blank supplied arguments.
Parameters:
values (floating point, one or more)
one or more numeric values
Return Value (floating point):
population standard deviation of values
Example:
stdev(-3, -2, 0, 0, 1, 2, 3, 4, 5, 6) = 2.8
Signature:
double stdev(double...)