By using the basic definition of a quartile. Sort the data, count how many there are in total, then count off one quarter of that. For example, if you have 80 data items, count off the first 20 items (after sorting).
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You take the largest number in the Set of data and then subtract it from the smallest number in that data
The median is the middle number in a data set. The lower class boundary is the first quartile or number that is 25 percent lowest in the data set.
It may be an outlier.
A set of data can be described to the spreadsheet as a range by specifying the beginning cell, in the upper left corner of the data, and the ending cell, in the lower right corner of the data.
A number does not have a quartile, a set of data does. The lower quartile of a set of data set is a value, in the data set, such that a quarter of the date set are smaller and three quarters are larger. The upper quartile is defined similarly. The middle quartile, better known as the median, divides the data set in two.