60 C d a The mean is b The standard deviation is e 64 Use the Empirical Rule to answer the following questions f 68 g h 72 Test Scores 76 80 Question Help Video Message in of the test scores are between 68 and 76 of the test scores are between 64 and 80 of the test scores are between 60 and 84 of the test scores are between 72 and 76 of the test scores are less than 72 of the test scores are less than 76 84 a