Question

    The average of 10 observations is 46. It was realized

    later that an observation was misread as 42 in place of 142. The correct average is:
    A 52 Correct Answer Incorrect Answer
    B 46 Correct Answer Incorrect Answer
    C 58 Correct Answer Incorrect Answer
    D 56 Correct Answer Incorrect Answer

    Solution

    Sum of all numbers = 46 × 10 = 460 Correct sum = 460 - 42 + 142 ⇒ 602 - 42 ⇒ 560 Correct Average = 560/10 ⇒ 56 ∴ The correct average is 56.

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