Question: Porphyrin is a pigment in blood protoplasm and other body fluids that is significant in body energy and storage. Let x be a random variable that represents the number of milligrams of porphyrin per deciliter of blood. In healthy adults, x is approximately normally distributed with mean \(\mu =38\) and standard deviation \(\sigma =12\) .

What is the probability that

a. x is less than 60?

b. x is greater than 16

c. x is between 16 and 60?

d. x is more than 60? (This may indicate and infection, anemia, or another type of illness)