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:
    A 60 Correct Answer Incorrect Answer
    B 140 Correct Answer Incorrect Answer
    C 120 Correct Answer Incorrect Answer
    D 100 Correct Answer Incorrect Answer

    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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