how to find quartile excel
For Lower Quartile: 1  Sort all observations in ascending order. 2  Compute the position L1 = 0.25 * N, where N is the total number of observations. 3  If L1 is a whole number, the lower quartile is midway between the L1-th value and the next one.  If L1 is not a whole number, change it by rounding up to the nearest integer.