7). I need help Asap. Thanks

In a statistics course, a midterm exam results in an average score of 71.13 with a standard deviation of 11.9. Given the class performance, you are tasked with setting grade boundaries based on percentile ranks. How would you assign the percentile ranges for grades A through F. if A represents the top 10% of scores, B spans the 80th to 90th percentile, C covers from the 70th to 80th percentile, D includes the 50th to 60th percentile, and F comprises scores below the 50th percentile? Calculate the specific score ranges for each grade category