19. In an article about the cost of health care, Money magazine reported that a visit to a hospi- tal emergency room for something as simple as a sore throat has a mean cost of $323 (Money, January 2009). Assume that the cost for this type of hospital emergency room visit is normally distributed with a standard deviation of $92. Answer the following questions about the cost of a hospital emergency room visit for this medical service. a. What is the probability that the cost will be more than $500? b. What is the probability that the cost will be less than $250? c- What is the probability that the cost will be between $300 and $400? d. If the cost to a patient is in the lower 3% of Charges for this medical service, what was the cost of this patient's emergency room visit