The average cholesterol level for women in the United States is 209.4 mg/dl (milligrams per deciliter) with a standard deviation of 42.9 mg/dl. The Center for Disease Control (CDC) considers cholesterol levels less than 200 mg/dL to be be 'normal'.

What proportion of US women havecholesterol levels that are considered 'normal'?

Assume the cholesterol levels of women can be described by a Normaldistribution.