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 for a university is 520. Assume that GMAT scores are bell-shaped with a standard deviation of 50. If required, round your answers to one decimal place. (a) What percentage of GMAT scores are 570 or higher? \"/0 (b) What percentage of GMAT scores are 620 or higher? \"/0 (c) What percentage of GMAT scores are between 470 and 520? \"/0 (d) What percentage of GMAT scores are between 420 and 570? \"/0