Hi I need the formula and the work please TX 10, A research study examined the blood vitamin D levels of the entire US population of landscape

Hi I need the formula and the work please TX

10, 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 45.72 ng/mL with a standard deviation of 5.922 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 49.61 ng/mL 

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