https://towardsdatascience.com/ways-to-detect-and-remove-the-outliers-404d16608dba
And we can use box plot to identify outliers.
the data outside of the whiskers are outliers.
boxplot(mpg~cyl,data=mtcars, main="Car Milage Data", xlab="Number of Cylinders", ylab="Miles Per Gallon")
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