Answer:
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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