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 51.67 ng/mL with a standard deviation of 5.792 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 42.17 and 60.90 ng/mL? Please show your work.

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