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    Question

    A student's marks were wrongly entered as 65 instead of

    45. Due to this, the average marks for the class increased by 1 /3 The number of students in the class is
    A 80 Correct Answer Incorrect Answer
    B 40 Correct Answer Incorrect Answer
    C 20 Correct Answer Incorrect Answer
    D 60 Correct Answer Incorrect Answer

    Solution

    Actual mark of a student =45 but wrongly entered = 65 wrongly increased marks = 65-45 =20 so now - Let the number of students = x Increased average marks = 1/3 20/x =1/3 x=60

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