Find the range of arsenic blood concentrations

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Find the range of arsenic blood concentrations

Question: Arsenic is a compound naturally occurring in very low concentrations. Arsenic blood concentrations in healthy individuals are Normally distributed with mean =3.2 ug/dl and standard deviation = 1.5 ug/dl. What is the range of arsenic blood concentrations corresponding to the miIDle 90% of healthy adults?

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