Fingerprint expertise. Refer to the Psychological Science

(Aug. 2011) study of fingerprint identification, Exercise 4.74

(p. 240). Recall that the study found that when presented with prints from the same individual, a novice will correctly identify the match only 75% of the time. Now consider a sample of 120 different pairs of fingerprints where each pair is a match.

a. Estimate the probability that a novice will correctly identify the match in more than half of all pairs of fingerprints.

b. Estimate the probability that a novice will correctly identify the match in fewer than 100 pairs of fingerprints.