In the 1970s, a group of researchers wanted to investigate the relationship between smoking and pulmonary function in children under 18 years old. They collected a sample of several hundred children in East Boston, Massachusetts. For each child, they recorded the child’s age, sex, height, and whether or not the child was a smoker. Then, to measure lung function, they recorded each child’s Forced Expiratory Volume (FEV), which is the amount of air they were able to exhale, concentrating, for one full second. An Excel file is provided, "FEV-Data.xlsx," that includes data from this study. What is the shape of the distribution of FEV for all observations?