Calculates the population standard deviation.
function PopnStdDev(const Data: array of Double): Extended;
Extended PopnStdDev(const array of Double Data);
PopnStdDev calculates the population standard deviation (the square root of the population variance) of all values in the Data array parameter. In C++, the Data_Size parameter indicates the index of the last element in Data (one less than the number of data points).
This function is used in some business and financial calculations.
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