To study people's ability to deceive lie detectors researchers sometimes use the "guilty knowledge' technique. Certain subjects memorize six common word other subjects memorize no words. Each subject is the tested on a polygraph machine (lie detector), as following the experimenter reads, in random order, 24 words: the; six "critical" words (the memorized list) and, for each critical word, three "control" words with similar or related meanings. If the subject has memorized the six words, he or she tries to conceal that fact. The subject is scored a "failure" on a critical word if his or her electro-derma response is higher on the critical word than on any of the three control words. Thus, on each of the six critical words even an innocent subject would have a 25% chance of failing. Suppose a subject is labeled "guilty" if the subject fails on four or more of the six critical words. If an innocent subject is tested, what is the probability that he or she will be labeled "guilty"?