values that divide a list of numbers into quaters is called a quartile.
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If the result is 1.5 x Inter Quartile Range (or more) above the Upper Quartile or 1.5 x Inter Quartile Range (or more) below the Lower Quartile.
you do work out the upper and lower quartile
It is the upper quartile minus the lower quartile.
the IQR is the third quartile minus the first quartile.
The interquartile range :)