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      Question

      Find the value of 'a' in the given data if the mean of

      the given data is 12. 8, 10, 15, 14, 9, 13, a, 7, 11, 12
      A 19 Correct Answer Incorrect Answer
      B 20 Correct Answer Incorrect Answer
      C 21 Correct Answer Incorrect Answer
      D 22 Correct Answer Incorrect Answer

      Solution

      Sum of each term of given data = 10 × 12 = 120 So, 8 + 10 + 15 + 14 + 9 + 13 + a + 7 + 11 + 12 = 120 Or, 99 + a = 120 Or, 'a' = 21 Hence, option C.

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