Every parent cares about their children’s academic grades. Grades are calculated on their marks. But how many parents really understand the meaning of average marks ?
If there are 40 students in a class and the average mark is 70. If a student got 75 marks, will the parents grateful because the student are above average ?
If they thought that getting marks above the average means better off than half of the students, then they were seriously wrong. Take for an example:
If the marks for this 40 students are as follow:
100 – 1 ppl
95 – 2 ppl
90 – 4 ppl
85 – 10 ppl
80 – 12 ppl
75 – 1 ppl
35 – 3 ppl
30 – 2 ppl
20 – 5 ppl
The average mark is 70. However. students which scores below 75 marks are only 10 people, and students scores above 75 marks are 29 people. This means that the student who got 75marks ranks 30th of out 40. Is there anything to be grateful of ?
The reason of getting the results shown above, is because the scores have big differences. The average mark is not significant enough to reflect the rankings of the students.