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      Question

      If Arithmetic mean and coefficient of variation of x

      are 10 and 40 respectively, then the variance of y = 10 – 2x is:
      A 32 Correct Answer Incorrect Answer
      B 64 Correct Answer Incorrect Answer
      C 22 Correct Answer Incorrect Answer
      D 16 Correct Answer Incorrect Answer

      Solution

      The correct answer is B

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