The average of marks of 14 student was calculated as 71 But it was later found that the marks of one...........

Quantitative Aptitude ( CCS) Average

The average of marks of 14 student was calculated as 71. But it was later found that the marks of one students had been wrongly entered as 42 instead of 56 and of another as 74 instead of 32. The correct average is

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Explanation:

According to the question.
Wrong marks = 42 + 74 = 116
correct marks = 56 + 32 = 88
Difference = 116 - 88 = 28 marks
? This difference effect the 14 students = 28/14 = 2
and, Incorrect average = 71
∴ correct average = 71 - 2 = 69

Hence, option 3 is the correct answer.