Arsenic occurs naturally in very low concentrations. In healthy human adults arsenic blood concentrations are approximately...

Arsenic occurs naturally in very low concentrations. In healthy human adults arsenic blood concentrations are approximately Normally distributed with mean 3.9 μg/dL (micrograms per decilitre) and standard deviation 1.4 μg/dL. For the purposes of this question, assume that the distribution of arsenic blood concentrations is exactly as just described. (a) What proportion of healthy adults have arsenic blood concentrations between 2 and 4.5 μg/dL? [3] (b) Choosing a healthy adult at random, what is the chance that their arsenic blood concentration exceeds 6.8 μg/dL? [2] (c) What are the lower and upper limits of the middle 80% of arsenic blood concentrations in healthy human adults?

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orchestra answered 1 year ago

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Arsenic occurs naturally in very low concentrations. In healthy human adults arsenic blood concentrations are approximately...

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