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      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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