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 μ = 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 an infection, anemia or another type of illness)