Hi i need the formula and work examples please Tx 4, A research study examined the blood vitamin D levels of the entire US population of landscape

Hi i need the formula and work examples please Tx

4, 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 53.27 ng/mL with a standard deviation of 4.178 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 likelihood that his/her vitamin D level will be 50.61 ng/mL 

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