This document discusses porphyrin, a pigment in blood that is important for energy and storage. Porphyrin levels in the blood are normally distributed with a mean of 38 mg/dL and standard deviation of 11 mg/dL. The question asks for the probability that a porphyrin level is greater than 60 mg/dL, rounded to 4 decimal places. Excel can be used to calculate the probability, especially the Normal distribution file.