) A research study examined the blood vitamin D levels of the entire US population of landscape gardeners. The population average level of vitamin D...

1.) 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 39.03 ng/mL with a standard deviation of 4.11 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 46.26 and 51.86 ng/mL? please provided steps to problem

2.) 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 45.96 ng/mL with a standard deviation of 4.436 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 50.65 ng/mL or more? please provided steps to problem