This document discusses measures of location in data (quartiles, deciles, and percentiles). It provides the definitions and formulas for calculating quartiles, deciles, and percentiles for both single data and grouped data. It then gives an example problem calculating the second quartile, third quartile, sixth decile, 27th percentile, and 80th percentile for a data set with values ranging from 50-99 in groups of 10 and associated frequencies. The solutions show the application of the formulas to determine the value of each measure of location.