Suppose a professor uses a normal distribution to assign grades in her math class. She assigns an A to students scoring more than 2.1 standard deviations above the mean and an F to students scoring more than 2 standard deviations below the mean. She assigns a B to students who score between 1.1 and 2.1 standard deviations above the mean and a D to students who score between 0.9 and 2 standard deviations below the mean. All other students get a C. What percent of the class receives each grade assuming the scores are normally distributed?