The table below provides the percentage of marks obtained by students, A, B, C, D and E in each of the six semesters. Study the table and answer the following question.
 

Students	First Sem	Second Sem	Third Sem	Fourth Sem	Fifth Sem	Sixth Sem
A	74	79	73	78	72	86
B	55	51	68	53	72	69
C	40	43	50	52	60	66
D	59	59	58	57	59	57
E	66	76	71	81	89	92

 

What is the approximate absolute difference between the overall percentage of A and E for the six semesters?

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