A large number of applicants for admission to graduate study in business are given an aptitude test. Scores are normally distributed with a mean of 460 and standard deviation of 80. It is known that the interquartile range IQR for standard normal distribution is 1.3. What fraction of the applicants would you expect to have a score of 512 or below? O a. 0.75 O b. 0.84 O c. 0.16 O d. None of the above O e. 0.25