Hello pls help statistics

From the grouped frequency distribution of the data, calculate the following: 20' Q QP P P , P D . D, D and D. 25' 75' 90' 8The following data are final grades of 60 students in Statistics. 78 75 77 81 87 76 73 78 85 76 86 79 79 90 93 85 83 87 85 87 91 80 84 85 86 83 84 81 79 81 84 83 82 85 80 84 88 85 80 82 79 80 79 81 74 79 83 78 80 76 75 88 81 76 75 74 79 87 80 78