The Distribution of Cholesterol Levels in Teenage Boys Is Approximately $\mu$

Multiple Choice

The distribution of cholesterol levels in teenage boys is approximately normal with $\mu$ = 170 and $\sigma$ = 30 (Source: U.S. National Center for Health Statistics) . Levels above 200 warrant attention. What percent of teenage boys
Have levels between 170 and 225?

A) 3.36%
B) 6.06%
C) 46.64%
D) 56.13%