To gauge their fear of going to a dentist, a large group of adults completed the Modified Dental Anxiety Scale questionnaire. Scores (X) on the scale ranges from zero (no anxiety) to 25 (extreme anxiety). Assume that the distribution of scores is normal with mean = 11 and standard deviation = 5. Find the probability that a randomly selected adult scores between 11 -5 and 11 + (2)(5) .