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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' = тИЪab
    So, k = тИЪ(2.25 ├Ч 4) = тИЪ9 = 3
    Required value = 3 ├Ч 3 = 9

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