Question

Cholesterol levels for teenage boys can be modeled by a normal distribution with mean 150 mg/dl and standard deviation 25 mg/dl. About 0.15% of 14-year-old boys have cholesterol levels less than what value?

Answer 1

about 75.8 mg/dl

Explanation:

You want to know the level below which lies 0.15% of the population if the mean is 150 mg/dl and the standard deviation is 25 mg/dl.

Inverse Normal

The inverse normal function can be used to find the value corresponding to an area of 0.15% under the normal curve. A calculator shows that threshold to be about 75.8 mg/dl.

About 0.15% of boys have a cholesterol level less than 75.8 mg/dl.

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