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      Question

      Mean and Standard deviation of 100 observation is 50 and

      10 respectively. What will be the new mean and Standard deviation if each observation is multiplied by 3?
      A 53 and 13 Correct Answer Incorrect Answer
      B 53 and 10 Correct Answer Incorrect Answer
      C 150 and 30 Correct Answer Incorrect Answer
      D 150 and 10 Correct Answer Incorrect Answer
      E 50 and 30 Correct Answer Incorrect Answer

      Solution

      Both mean and SD are affected by change in scale New Mean = 50*3 = 150 New SD = 10*3 = 30

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