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      Question

      If the mean proportion of 2.25 and 4 is 'k', then find the

      value of '3k'.
      A 6 Correct Answer Incorrect Answer
      B 9 Correct Answer Incorrect Answer
      C 12 Correct Answer Incorrect Answer
      D 7 Correct Answer Incorrect Answer

      Solution

      Mean proportion of two numbers 'a' and 'b' = √ab
      So, k = √(2.25 Γ— 4) = √9 = 3
      Required value = 3 Γ— 3 = 9

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