Porphyrin is the pigment in blood protoplasm as well as other body fluids that is significant in body energy and storage. Let x be a random variable which 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
(a) Find out the probability that x is less than 60.
b) Find out the probability that x is greater than 16.
c) Find out the probability that x is between 16 and 60.
d) Find out the probability that x is more than than 60. (This may indicate infection, anemia, or another type of illness.)