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Dental Anxiety Scale. Psychology students at Wittenberg University completed the Dental Anxiety Scale questionnaire (Psychological Reports, August 1997). 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 μ = 11 and σ = 3.5.

(a) Suppose you score a 16 on the Dental Anxiety Scale. Find the z-value for this score.

(b) Find the probability that someone scores between a 10 and a 15 on the Dental Anxiety Scale.

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