O sson App 2.6 Macmillan: Starnes/Statistics and X + cfi/6/64[sta_9781319244323_ch02_071!/4/2[sta_9781319251826_yfUGZLWAaZ]/10[sta_97813192518... APES 2e Big Picture... The 10 Most Endan... Q High levels of cholesterol in the blood increase the risk of heart disease. For teenage boys, the distribution of blood cholesterol is approximately normal with mean u = 151.6 milligrams of cholesterol per deciliter of blood (mg/dl) and standard deviation o = 25 (mg/dl). 1. Find the 20th percentile of the distribution of blood cholesterol for teen boys. For teenage girls, the distribution of blood cholesterol is approximately normal with mean u = 157.5 milligrams of cholesterol per deciliter of blood (mg/dl). About 8.9% of teen girls have high cholesterol-that is, levels of 200 mg/dl or greater. 2. Find the standard deviation of the distribution of blood cholesterol for teen girls. Lesson 2.6 WHAT DID YOU LEARN? 9