What are the quintiles of gas mileage?

Quintiles of gas mileage divide a dataset into five equal parts, each representing 20% of the data points. To determine the quintiles, you would rank the gas mileage values from lowest to highest and identify the values that separate these five groups. The first quintile (Q1) marks the 20th percentile, the second quintile (Q2) is the median or 50th percentile, and the third (Q3) is the 80th percentile. This analysis helps to understand the distribution and range of gas mileage across different vehicles.