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 40.27 ng/mL with a standard deviation of 6 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 45.23 ng/mL or less?