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 547. Assume that GMAT scores are bell-shaped with a standard deviation of 100. (a) What percentage of GMAT scores are 647 or higher? __________ (b) What percentage of GMAT scores are 747 or higher? __________ (c) What percentage of GMAT scores are between 347 and 547? ___________ (d) What percentage of GMAT scores are between 447 and 747? ________