Diabetes is closely related to a person's level of blood
glucose, measured in milligrams of glucose per deciliter (1/10 of a
liter) of blood. Let x be a random variable that represents the
12-hour fast blood glucose level. This distribution is
approximately normal with mean = 86 and standard deviation = 23.
(Note: Blood glucose levels tend to increase after the age of 50,
so the mean and standard deviation also change.) Find the
probability that a randomly selected person under the age of 50 has
a 12-hour fast blood glucose level x > 63.