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Question

The average marks of 50 students in an examination was 65. It was later found that the marks of one student had been wrongly entered as 83 instead of 38. The correct average is?

A 63.9 Correct Answer Incorrect Answer
B 64.5 Correct Answer Incorrect Answer
C 64.7 Correct Answer Incorrect Answer
D 64.1 Correct Answer Incorrect Answer

Solution

Sum of scores of all students=50*65 =3250 Adding and removing correct value and wrong value respectively i.e 3250-83+38=3205 Correct average=3205/50 =64.1

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