Refer to the Applied Psychology in Criminal Justice (Sept. 2009) study of convicted drug dealers' motivations, Exercise 2.102 (p. 77). 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 dealer with a WR score of 30 points.
b. What proportion of the sampled drug dealers had WR scores below 39 points? (Assume the distribution of WR scores is mound shaped and symmetric.)