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    Question

    Two data set of size 9 and 6 have standard deviation 3

    and 4 respectively and arithmetic means 3 and 3 respectively. The standard deviation of combined data set of size 15 is
    A тИЪ(177/15) Correct Answer Incorrect Answer
    B тИЪ(175/15) Correct Answer Incorrect Answer
    C тИЪ(178/15) Correct Answer Incorrect Answer
    D тИЪ(176/15) Correct Answer Incorrect Answer

    Solution

    The correct answer is A

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