Suppose that the distribution of scores on an exam is mound shaped and approximately symmetric. The exam scores have a mean of 100 and the 16th is 75. (Use the Empirical Rule.) (a) What is the 84th percentile (b) What is the approximate value of the standard deviation of exam scores? (c) What is the z-score for an exam score of 90? (d) What percentile corresponds to an exam score of 150? % (e) Do you think there were many scores below 25? Explain. READ AND COMPLETE THE FOLLOWING STATEMENT. Since a score of 25 is Select Select Scores below 25. below the mean, that corresponds to a percentile of percentile