The average marks of 12 students is 15 . The marks of a student who scored 0 were wrongly written as 28 and average was determined . Find the correct average marks.
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Wrong avg = 15.
Sum of marks/12 = 15.
Sum = 12*15
= 60
0 is written as 28.
Then
Correct sum = 60 - 28
= 42.
Correct avg = 42/12
= 3.5
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