Psychology students at wittenberg university completed the dental anxiety scale questionnaire. scores on the scale range from 0 (no anxiety) to 20 (extreme anxiety). the mean score was 11 and the standard deviation was 3.5. assume that the distribution of all scores on the dental anxiety scale is normal with with \mu = 11 and \sigma = 3.5.
a) find the probability that someone scores between a 10 and a 15 on the dental anxiety scale.
b) find the probability that someone scores above a 17 on the dental anxiety scale.