Aperson's level of blood glucose and diabetes are closely related. let x be a random variable measured in milligrams of glucose per deciliter (1/10 of a liter) of blood. suppose that after a 12-hour fast, the random variable x will have a distribution that is approximately normal with mean and standard deviation of what is the probability that, for an adult after a 12-hour fast, x is between 60 and 66?