A single number X is used as an estimate for the value of numbers, then the statistical mean minimizes the sum of the squares (xi - X)2 of the residuals. Statistical mean is popular because it includes every item in the data set and it can easily be used with other statistical measurements.
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The following functions provide locale-independent string to number conversions. Convert a string s to a double, raising a Python exception on failure. The set of accepted strings corresponds to the set of strings accepted by Pythonâs constructor, except that s must not have leading or trailing whitespace. The conversion is independent of the current locale.