Question : The average mark secured by 36 students was 52. However, it was discovered that item 64 was misread as 46. What is the correct mean of marks?
Option 1: 54
Option 2: 53.5
Option 3: 53
Option 4: 52.5
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Correct Answer: 52.5
Solution :
Given: The average mark secured by 36 students was 52.
But item 64 was misread as 46.
So, difference = 64 – 46 = 18
The correct average = 52 + $\frac{18}{36}$ = 52.5
Hence, the correct answer is 52.5.
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