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...sample variance of data, optionally using xbar as the sample mean. stdev(data, xbar=None) sample standard deviation of data, optionally using xbar as the sample mean. pvariance(data, mu=None) population variance of data, optionally using mu as the population mean. pstdev(data, mu=None) population standard deviation of data, optionally using mu as the population mean. Other functions There is one other public function: sum(data, start=0) high-precision sum of numeric data. S...