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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 46.51 ng/mL with a standard deviation of 4.322 ng/mL. Assuming the true distribution of blood vitamin D levels follows a normal distribution, if you randomly select a landscaper in the US, what is the probability that his/her vitamin D level will be 53.48 ng/mL or less?

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