Question
The student's marks were wrongly entered as 55 instead
of 25. Due to this, the average marks for the class increased by 1 /4 The number of students in the class is:Solution
Actual mark of a student =25 but wrongly entered = 55 wrongly increased marks = 55-25 =30 so now - Let the number of students = x Increased average marks = 1/3 30/x =1/4 x =120
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