The distribution of cholesterol levels in teenage boys is ap

The distribution of cholesterol levels in teenage boys is approximately normal with ? = 170 and ? = 30 Levels above 200 warrant attention. What percent of teenage boys have levels between 170 and 225? The correct answer is 3.36% can you show me the steps

Solution

We want to find the P(170<x<225).
To do so we find the z scores associated with both 170 and 225.

z= (x-