Medical: Blood Protoplasm 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 m 5 38 and standard deviation s 512 (see reference in Problem 25). 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.)

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