The average marks obtained by 12 students was calculated 72 but later, it was found that the marks of one student was wrongly read as 86 instead of 68. Find the correct average?
Explanation
Given,
Average marks obtained by 12 students caluclated as 72
= 12×72 = 864
later, it was found that 1 student was wrongly read as 86 instead of 68
= (864-86+68)
= 846
The Correct average =
= 70.5
Hence, Option B s correct.
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