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    Question

    The average of 30 numbers was initially calculated as

    45. However, it was later found that one of the numbers had been incorrectly recorded as 83 instead of 8. What is the correct average of these 30 numbers after this correction?
    A 42.5 Correct Answer Incorrect Answer
    B 36.5 Correct Answer Incorrect Answer
    C 39.4 Correct Answer Incorrect Answer
    D 47.7 Correct Answer Incorrect Answer

    Solution

    Total number will be decreased by (83-8) = 75 Average will decrease by = 75/30 = 2.5 Correct average = 45 – 2.5= 42.5

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