Low‑density lipoprotein, or ldl, is the main source of cholesterol buildup and blockage in the arteries. this is why ldl is known as "bad cholesterol." ldl is measured in milligrams per deciliter of blood, or mg/dl. in a population of adults at risk for cardiovascular problems, the distribution of ldl levels is normal, with a mean of 123 mg/dl and a standard deviation of 41 mg/dl. if an individual's ldl is at least 1 standard deviation or more above the mean, he or she will be monitored carefully by a doctor. what percentage of individuals from this population will have ldl levels 1 or more standard deviations above the mean? use the 68 – 95 – 99.7 rule.