In a final exam in a Statistics course, the mean mark of a group of 150 students was 78 and the standard deviation is 8. In Mathematics exam of the same group, the mean was 73 and the standard...

In a final exam in a Statistics course, the mean mark of a group of 150 students was 78 and the standard deviation is 8. In Mathematics exam of the same group, the mean was 73 and the standard deviation was 7.6. a) In which group was there a greater dispersion? b) Suppose a student scored 75 in Statistics and 71 in Mathematics. In which exam was his relative standing better? c) Suppose Student “ A ” scored 80 in Statistics and 75 in Mathematics while student “ B” scored 75 in Statistics and 80 in mathematics , whose performance is better A or B ? why?