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An industrial process produces batches of a chemical whose impurity level follows a normal distribution with a standard deviation of 1.6 grams of chemical. A

An industrial process produces batches of a chemical whose impurity level follows a normal distribution with a standard deviation of 1.6 grams of chemical. A random sample of 100 batches is selected in order to estimate the population mean impurity level,the probability is 0.1841 that the sample mean impurity level is below the population mean by how much?

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