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    Question

    A batch of 28 students had their average science score

    recorded as 66. Later it was identified that 70 was wrongly recorded as 60, and 65 was noted instead of 68. What is the correct average?
    A 57.74 Correct Answer Incorrect Answer
    B 50.14 Correct Answer Incorrect Answer
    C 66.46 Correct Answer Incorrect Answer
    D 73.14 Correct Answer Incorrect Answer

    Solution

    ATQ,

    Correct average

    = {(28 × 66) – 60 + 70 – 65 + 68} / 28

    = {1848 – 60 + 70 – 65 + 68} / 28

    = 1848 – 60 = 1788 + 70 = 1858 – 65 = 1793 + 68 = 1861

    Correct average = 1861 / 28 = 66.46

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