how many adults would have low bone mineral density, even at a younger age.

A study of 20 college students was conducted to see how many adults would have low bone mineral density, even at a younger age. Investigators wish to know what is theprobability of having a bone mineral density score less than 2 units below the unknown mean bone mineral density (BMD) of the general college population country-wide.
The standard deviation was measured to be 6.

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