find the ratio of variation by using galtons graph method and convert x and y series into index number based on their respective mean values and plot the indices of the subject of on vertical scale.

Study Hours Prep Exams Final Exam Score Student 1 3 2 76 Student 2 7 6 88 Student 3 16 5 96 Student 4 14 2 90 Student 5 12 7 98 Student 6 7 4 80 Student 7 4 4 86 Student 8 19 2 89 Student 9 4 8 68 Student 10 8 4 75 Student 11 8 1 72 Student 12 w 76