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    Question

    In the Board exams, the average marks scored by 20

    students is 55. But while calculating, marks of 2 students were wrongly entered as 43 and 60 in place of 54 and 45. Then, what will be the correct average marks of the 20 students.
    A 44.8 Correct Answer Incorrect Answer
    B 64.8 Correct Answer Incorrect Answer
    C 54.8 Correct Answer Incorrect Answer
    D 88.8 Correct Answer Incorrect Answer
    E none of these Correct Answer Incorrect Answer

    Solution

    ATQ, Total marks which are (incorrect) in Board exam are   = 55 × 20 = 1100 Now, the correct total marks will be =  1100 + (54 + 45) – (43 + 60) = 1096 Correct average marks =  (1096/20) =  = 54.8

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