A finance professor has just given a midterm examination in her corporate finance course. In particular, she is now interested in assigning letter grades to the scores earned by her 100 students who took this exam. The top 10% of all ordered scores should receive a grade of 

A. The next 10% of all ordered scores should be assigned a grade of 

B. The third 10% of all ordered scores should receive a grade of 

C. The next 10% of all ordered scores should be assigned a grade of 

D. All subsequent scores should be considered to be failing (i.e., equivalent to F grades). The100 exam scores are given in the file P2_5.XLS. Assist this instructor in assigning letter grades to each of the given finance exam scores.