the graduate management admission test (gmat) is a standardized exam used by many universities as part of the assessment for admission to graduate study in business. the average gmat score is (magoosh website). assume that gmat scores are bell-shaped with a standard deviation of . use the empirical rule to answer the following. a. what percentage of gmat scores are or higher (to decimal)? b. what percentage of gmat scores are or higher (to decimal)? c. what percentage of gmat scores are between and (to decimal)? d. what percentage of gmat scores are between and (to decimal)?