At Jen and Perry Ice Cream Company, the machine that fills -pound cartons of Top Flavor ice cream is set to dispense ounces of ice cream into every carton. However, some cartons contain slightly less than and some contain slightly more than ounces of ice cream. The amounts of ice cream in all such cartons have a normal distribution with a mean of ounces and a standard deviation of ounces. Find the probability that a randomly selected carton contains to ounces of ice cream.