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      Question

      Two data sets of sizes 6 and 9 have standard deviation

      3 and 4, respectively, and arithmetic means 4 and 4, respectively. The standard deviation of combined data set of size 15 is:
      A тИЪ(72/5) Correct Answer Incorrect Answer
      B тИЪ(68/5) Correct Answer Incorrect Answer
      C тИЪ(70/5) Correct Answer Incorrect Answer
      D тИЪ(66/5) Correct Answer Incorrect Answer

      Solution

      The correct answer is D

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