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A research study examined the blood vitamin D levels of the entire US population of landscape...

A research study examined the blood vitamin D levels of the entire US population of landscape gardeners. The population average level of vitamin D in US landscapers was found to be 42.93 ng/mL with a standard deviation of 4.251 ng/mL. Assuming the true distribution of blood vitamin D levels follows a Gaussian distribution, if you randomly select a landscaper in the US, what is the probability that his/her vitamin D level will be between 32.13 and 43.89 ng/mL?

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