Refer to the Applied Psychology in Criminal Justice (Sep. 2009) study of convicted drug dealers' motivations, Exercise

Question:

Refer to the Applied Psychology in Criminal Justice (Sep. 2009) study of convicted drug dealers' motivations, Exercise 2.80 (p. 85). Recall that the sample of drug dealers had a mean Wanting Recognition (WR) score of 39 points, with a standard deviation of 6 points.
a. Find and interpret the z-score for a drug with a WR score of 30 points.
b. What proportion of the sampled drug dealers had WR scores below 39 points? (Assume the of WR scores is mound-shaped and symmetric.)
c. If 5% of convicted drug dealers have WR scores above 49 points, give a percentile ranking for the WR score of 49.
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