**How to Use Probability Distributions in Excel - dummies**
https://www.dummies.com/software/microsoft-office/excel/how-to-use-probability-distributions-in-excel/

The ZTEST function calculates the probability that a value comes from the same population as a sample. The function uses the syntax =ZTEST (array, x, [ sigma ]) where array is the worksheet range holding your sample, x is the value you want to test, and (optionally) sigma is the standard deviation of the population.

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