Question

    The average score of 20 students in a test is 65. Later

    it is found that the score of one student was wrongly taken as 54 instead of 84. What will be the correct average?
    A 75 Correct Answer Incorrect Answer
    B 33.5 Correct Answer Incorrect Answer
    C 66.5 Correct Answer Incorrect Answer
    D 47 Correct Answer Incorrect Answer

    Solution

    Wrong total = 20 × 65 = 1300 Correct total = 1300 − 54 + 84 = 1300 + 30 = 1330 Correct average = 1330 / 20 = 66.5 Hence, Correct average = 66.5.

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