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      Question

      Find the mean proportion of 8.4 and 18.9.

      A 25.2 Correct Answer Incorrect Answer
      B 18.4 Correct Answer Incorrect Answer
      C 12.6 Correct Answer Incorrect Answer
      D 16.8 Correct Answer Incorrect Answer

      Solution

      Mean proportion of 'a' and 'b' = โˆšab So, required mean proportion = โˆš(8.4 X 18.9) = โˆš(7 X 4 X 0.3 X 7 X 0.3 X 3 X 3) = 7 X 2 X 3 X 0.3 = 12.6

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