Your instructor tells you that his exam scores always show a 75% average score. But he thinks the class you’re in seems to be grasping the material better than his previous classes. You decide to test...

Your instructor tells you that his exam scores always show a 75% average score. But he thinks the class you’re in seems to be grasping the material better than his previous classes. You decide to test this. The reported mean on the exam for your class is 80% with a 10% standard deviation. There are 49 people in your class. Assuming α = 0.05, is he right about your class understanding better than previous classes (using the exam score as a measure of this)?