Whiskers extending from the box indicate variability outside the upper and lower quartiles. Outliers that differ significantly from the rest of the dataset may be plotted as individual points beyond ...

You will notice that the fact there is an outlier in this data (60 ... range is the difference between the upper quartile and lower quartile. Interquartile range = upper quartile - lower quartile ...

This will be the median. To find the lower quartile, use the same method as for the median, except use \(\frac{1}{4}\) of the total frequency rather than \(\frac{1}{2}\). To find the upper ...