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      Question

      The average of 8 numbers is 15. One number 21 is

      replaced by 9. Find the new average.
      A 13.5 Correct Answer Incorrect Answer
      B 12.5 Correct Answer Incorrect Answer
      C 21.3 Correct Answer Incorrect Answer
      D 33.3 Correct Answer Incorrect Answer

      Solution

      Original sum = 8*15 = 120 New sum = 120 − 21 + 9 = 108 New average = 108/8 = 13.5 Answer: 13.5

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