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Please use standard deviation and mean to identify an outliers in a the following data set: 18, 20, 22, 23, 24, 25, 25, 25, 25,

Please use standard deviation and mean to identify an outliers in a the following data set:

18, 20, 22, 23, 24, 25, 25, 25, 25, 26, 26, 26, 27, 28, 28, 29, 31, 32, 78, 99

Standard deviation: 19.9480246

Mean: 31.85

Please include any formulas and steps as I am trying to learn how to do it as opposed to using online calculators.

Thanks!

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