in final exam in a statistic 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 standard deviation was 7.6, then in which group was there a greater dispersion, suppose student A scored in Statistics 80 and and 75 in mathematics, while student B scored 75 in Statistics and 80 in mathematics, whose performance is better A or B?
