1. Dental anxiety study.To gauge their fear of going to a dentist , a random sample of adults completed the Modified Dental Anxiety Scale questionnaire, Scores on the scale range form zero ( no anxiety)to 25 (extreme anxiety) The mean score was 11 and the standard deviation was 4. Assume that the distribution of all scores is approximately normal with =11, and = 4

\

1. Suppose you score a 10 on theModified Dental Anxiety Scale. Find the Z-value for your score

1. Find the probability that someone scores between 10 and 15 on Modified Dental Anxiety Scale.

1. Find the probability that someone scores above 20 on Modified Dental Anxiety Scale