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    Question

    The marks of a student were entered as 88 instead of 68.

    Due to this, the average marks of the class increased by 0.5. What is the number of students in the class?
    A 40 Correct Answer Incorrect Answer
    B 36 Correct Answer Incorrect Answer
    C 24 Correct Answer Incorrect Answer
    D 32 Correct Answer Incorrect Answer

    Solution

    To find the number of students n: The error increased total marks by 88-68 = 20. This caused an average increase of 0.5 marks per student. ATQ-   0.5× n = 20. n= 20/0.5 = 40. Thus, the number of students is 40

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