Cholesterol Levels (Quantiles Plot)

Examine the normality of cholesterol levels.
Problem

In a study to investigate the relationships between various factors and heart disease, blood lipid screenings were conducted on a group of patients. Three months after an initial screening, data was collected from a second screening that included information such as gender, age, weight, total cholesterol, and history of heart disease.
Use a normal q-q plot to inspect the normality of total cholesterol level before we proceed with a simple linear regression with this variable as our response.