Question

    The average of 20 numbers is calculated as 35. However,

    it was later discovered that one of the numbers was mistakenly recorded as 28 instead of 82. What should the correct average of the 20 numbers be?
    A 35.5 Correct Answer Incorrect Answer
    B 36 Correct Answer Incorrect Answer
    C 36.4 Correct Answer Incorrect Answer
    D 37.7 Correct Answer Incorrect Answer

    Solution

    Total number will be increased by (82-28) = 54 Average will increase by = 54/20 = 2.7 Correct average = 35+2.7 = 37.7

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