PERCENTILES:

Example: 1st quartile = 25th percentile. 2nd quartile = median. 3rd quartile = 75th percentile. View Figure 3-11 (text p. 153) and Figure 3-12 (text p. 154) to see how percentiles are broken up. Procedure to Compute Quartiles: Rank the data from smallest to largest. Find the median (2nd quartile). ................
................